It is a bit difficult to see what group requires extreme durabillity. Reliability, yes, but not many people will ever fire over 5000 rounds from a handgun. Police won't; cop guns are carried a lot and shot little; yearly qualification does not involve a lot of ammunition fired.
The military is the same; rifles, carbines and machineguns take a beating in combat, but a military pistol worn out in combat would be a rarity. Where military pistols wear out is in familiarization firing, where the gun is fired hour after hour, day after day. But even there, with the reduction of the armed services, the days of huge training divisions is long gone.
Of course, a few folks, like exhibition shooters, will fire a lot of ammo, often provided free by the ammunition companies who sponsor the shooter. But while those folks do wear out pistols, they are the actually the least in need of a handgun; not only are they never in any danger, but when one gun wears out or fails, they are given another.
Jim