Well yeah, if you invent fantasy weapons that don't currently exist, of course you can make them amazing. A line of suicide FPVs will also be equally terrifying and they already exist. Really advancing under artillery barrage is something as old as WW1, a big UAV with a gun won't change trench warfare the same way attack helicopters didn't. Why suppress using gunfire when you can Recon UAV, lase and call in a loitering strike? In a war footing China can make more low end loitering munition than there's people in the US, so cost wouldn't even be a factor.
Any how there's about 2-3 pages of back and forth about this topic, let's just agree to disagree.
You are not considering a lot of real world factors.
Explosions are not directional. Well, they can be if you use shaped charges, but that’s not applicable in this scenario so can be discounted.
Having FPVs go boom right in front of your assault line is a great way to disrupt your advance. Troops do advance under general artillery barrage, but that artillery barrage needs to stop when your troops get close to contact, which has always and remains the main limitations with explosive suppression.
The suppressive effect of a LMG are much more directional and precise and can be used to suppress enemies without impacting on your own troops advance.
The other main problem with FPVs is pilots and jamming.
Just how many pivots does your FPV spam require? Also, in the future, FPVs are likely to become increasingly ineffective as jamming gets more develop and proliferated.
The way to deal with jamming is with bigger and more powerful antennas, better signal processing etc, all of which needs more power and space and makes the drone more expensive. Fine for big durable drones like this, less fine for tiny consumable drones like FPVs.
The fundamental solution to those problems is to use technology to take the pilot out of the equation and use fully autonomous suicide swarm drones. China basically has this tech near operational deployment stage, if it’s not there already just Google Chinese drones autonomously navigating forests for example.
Thus the biggest issue with your argument isn’t in pointing out the different strengths and weaknesses of the two types of drones, but in making the completely unnecessary and unreasonable assumption that China needs to pick one over the other.
In reality, the PLA will make extensive use of all drone types we know of and many more we don’t. You will have waves of autonomous mini suicide drones combing enemy positions for troops and weapons to explode. You will have swarms of armed dogbots and flying drones shooting every enemy they come across. You will have high end UCAVs and UAVs providing air strikes and live aero feeds to assets on the ground. You will have drone motherships coming in dropping off fresh suicide drones. You will have cargo drones coming in with weapons and supplies. You will have medivac drones hauling the wounded away. You will likely have mobile drone docks for drones to land to automatically rearm and swop out batteries and immediately head back into the fray without much downtime. You may even have drones airdropping commandos.
It’s funny looking at people taking Ukraine as the ultimate manifestation of drone warfare when they are barely scratching the surface of what is to come since they are literally cobbling their drone war together using commercial toys. This is why Chinese commentators are always so dismissive of Ukraine. It’s just two zero-base powers stumbling around figuring out their first steps. The PLA is much further down this development path and has a lot more capable military grade toys.