Well one reason for it would be the ergonomics of the gun, simply put a bullpup design is not as easy for a newbie to master compared to a conventional design. This is due in large part to the positioning of the magazine which changes the center of gravity to the back of the rifle.
Another reason would be that a conventional rifle allows for designs like a fold-able stock, which makes it much easier to carry around on marches or in cramped spaces like an IFV.
All weapon design is a Choice of Compromises. what you are willing to give up to get the final product of what you want.
Now I am not a Bull pup fan but I have to say in this Some of your arguments are actually backwards.
First The Magazine, Moving the magazine back and changing the center of gravity is actually a strong point for a bullpup as a well designed bullpup places the center of gravity over the shooter's hand this makes it very easy to shoot one handed. The issue though is that it takes longer to reload.
It also places the Action of the Gun closer to the shooters face causing issues for those southpaws among us. IE a Lefty shooting a Bull left handed has a bad habit of eating spent rounds. Some bullpups have ways around this others ignore it. QBZ95 ignores it, as the PLA insists that all are Right handed.
Next the Bullpup design is about the same length as a folding stock conventional rifle. Bullpups are optimized for close quarters like inside a vehicle. Folding stocks are a compromise made by conventional rifles to reduce the length of the weapon for storage. To do this they give up the rigidity of a fixed stock. Where a bull has issues though is that the length of pull is fixed.
Any one can fire a rifle, but learning how to shoot accurately, how to account for the center of gravity in the gun as well different firing poses. That takes time to master.
Ive heard stories from PLA soldiers that Type95 is actually quite easy to use. A first time user could probably learn the basics in an afternoon.
These are also Straw man arguments, A first time shooter is always going to have an easier time being trained on a new system as they have no preconceived notions.
This is Why I kinda like what the Israelis are doing with there rifle transition, The old guys are keeping the M4 carbines well the new kids are getting X95's. an Old hand with a new system has a habit of trying to keep using there old skills well a fresh soldier doesn't have those bad habits yet.
Because the QBZ95 series is now over a decade in service the issues of relearning the rifle are not pressing as most of the Old hands started with QBZ95's now as the Older hands have retired or been promoted out of Combat arms.
In fact, should the need arise, type95 can be mass produced and mass trained to every fighting age person in the case of another "people's war".
As to Mass Produced and Mass Trained, That's true of every modern rifle. In fact going back to the Granddaddy of all modern intermediate caliber rifles the STG44, It was Stamped parts with as little milling as possible.
The AK47 Type 1 was an attempt at Stamped Parts that failed leading to the milled Type 2 and Type 3 which were comprimises as the Russians couldn't make the Stamped Quality until the AKM and the AKM is the Universal AK.
The AR10 and then AR15, when they came around were "Space Age" but look at the materials. steel barrel and operating parts in an Aluminum receiver with Bakelite Stock and handguard. AK74 followed the AR15 in materials
You look at the M4 and M16A2 they changed from the flimsy but cheap Bakelite to Polymers. AK74M followed again. The Styer AUG is mostly Polymer and same for the G36, Why?
My point, all of these materials and technologies used for these rifles were designed and chosen because they were not just state of the art but because they were at the time CHEAP, And easy to mass produce for there National builders.
The Calibers and training again Easy to do. The intermediate caliber rifle in the 5-6mm range whether 5.45x39 or 5.56x45 or 5.8x42mm are designed to be soft shooting very flat trajectory rounds with a light weight to allow for new shooters to be able to easily master them and carry more of them.
Hey, if you upgraded a 1960s firearm with modern ammunition and accessory packages, it will still be more than enough to kill an enemy.
overly summarizing a lot of Army weapons are just this. From FALS to M4's The basics of modern Firearms are all using technologies that more or less fixed in the 1960's.
With the QBZ 95-1 upgrade , the rifle series is a solid weapon, accurate, and with the DBP10 is powerful enough. However the QBZ 95-1 still lacks good accessory support through rails and different mounts. So whilst it is a good weapon, its a terrible, or at least sub-standard weapon system by modern standards.
This is so far the most accurate statement. Here. The Upgrades of the QBZ95-1 solved issues of Ammunition and especially short comings of the safety and controls of the Rifle. but the weapon is still lacking in optics. It's Sub Par when you consider that more and more complaints of the Fragility of optics have been relegated to the dust bin of fools arguments.
The notion that bullpumps are inherently harder to shoot than conventional is pure fiction. The idea only takes roots in online shooting forums which are dominated by Americans, who are used to their AR15s and so find it a pain to actually have to learn a different style of shooting.
It's not just American shooters per say it's shooters who cut there teeth on Conventional rifles as a whole. It's like the guy who has driven a Car with an Automatic transmission all his life and suddenly gets a Car with a Stick.
You will have to go back to the concept of large cal battle fields for conventional rifles to have any distinct advantage over a bullpump. But for modern small cal rifles, the recoil is not enough for the front loaded mass of a conventional rifle to have any meaningful impact on performance.
The only key accessory they might consider issuing en mass would be an optic. But those optics will designed to fit the 95’s proprietary rail interface, so it’s a non-issue if the troops could not use their own personal optics (which again is a non issue since your average PLA grunt is not going to be able to afford a serious optic out of his own pocket, and PLA regulations would probably not allow them to mount them even if they could afford it.
Not necessarily as there are now plenty of 7.62x51mm Bullpup rifles. both the Russians and US have had 12.7mm bullpups as well. Really the Bullpup has fallen a bit from favor of late but mostly it's because in the End neither really has a super advantage over the other.