Ideally that should be the case, but actual combat experience in Afghanistan is more complicated. This is why the Germans up-armored their PzH2000. I suspect the Chinese did so for the same reasons, namely to make it more survivable against mortar rounds and some frontal attacks. I'd imagine some guerrilla fighters could sneak up on it from over a hill or sand dune and attack it using light arms from a distance of a few hundred meters.
Only have experience with towed pieces, but a properly set up firing position should have defensive positions all around.
Listening to M777 crewman from Afghanistan, fighters rarely snuck up to do anything of the sort and the guns rarely moved from FOBs. The most common attacks were timer set rocket/mortar attacks. Full on attacks were unheard of because HALO was very good.
Back to PLZ-45A4…
Funny that they took on this American-style naming…
As mentioned the Saudi/Kuwaiti connection is obvious. From the limited information I have seen, PLZ-45 performance has been satisfactory. So this is basically an upgrade package? Assuming they received technical feedback, this would almost be tailor made based on Yemen operations.