I wouldn’t say my Gen 5s got mushy, but more like a lot of drag and grit. I had one 19 that developed a 3 stage trigger. The firing pin block was causing a hiccup in the take up.
Maybe they need to be kept real clean? I don’t clean a lot. Just add lube unless it looks really bad. I’ve also put in the Lone Wolf channel liners. They are a lot smoother than the Glock channel liners and I think that helps a little. I haven’t polished the spring cups but I imagine that’s another good area to hit.
I don’t mind it. Glock triggers are fine even when they are bad ones. It’s more just that I like to tinker and see what changes can be made and what effects they have.
I may try a Gen 5 Johnny Glock trigger in one of the guns just for fun. My theory is that since the Gen 5s seem to have much tighter tolerances, the parts stack up and create more drag. I imagine with some type of aftermarket trigger that’s polished real well, you’ll eliminate any of these negative tendencies that seem to creep in to the gen 5s as they get more rounds.