Not most of the modern ones, which have MIM parts. Better change those parts at that round count..
Generalize much?
In the fall of 1991 and wither of 1992, I bought two 91A1 Colts strictly for beater duty, and I've beat on'em hard.
Together, they're approaching 400,000 rounds, about evenly split. They're both on their 3rd barrels, and they both came with MIM sears and disconnects among a few other parts.
One is still operating on the original sear and disconnect, and the other on the original sear. On that one, I changed out the disconnect at roughly 75,000 rounds...not because it failed, but because it looked a little worn and I wanted to nip any pending hammer follow issues in the bud. I also changed out the plunger tube on one of the Colts when one of the legs broke a couple years after being restaked.
A friend of mine brought a NRM Colt to me to have me replace the MIM sear and disconnect with aftermarket parts, despite me telling him that the OEM set would probably outlast his ammunition budget.
When he said that he didn't want the originals, I arranged a scientific experiment for him. I laid the sear on an anvil, arched side up, and whacked it 3-4 times with a 4 ounce hammer. It didn't break. It didn't crack. When I installed it in another pistol, it function as intended, albeit with a pretty rough trigger.
Then I clamped the disconnect in a vise and whacked it with the hammer. It didn't break until the 2nd lick...after it had bent about 15 degrees.
Good MIM can be very good. It's just not well suited for all applications. It doesn't generally fare very well with impact stresses, for example...as with a hammer...nor does it seem to like to be sprung as with an extractor. For most others tasks, it's fine assuming that it's good quality to start with.
And for the record, military/ordnance spec pistols weren't rattle-trap loose when they were new...and loose doesn't guarantee reliability any more than tight guarantees accuracy.
Too loose can be worse for reliability than a little too tight for a number of reasons...wide gaps allowing larger pieces of dirt and grit to get in being one of them.