I went shooting recently with someone who had a Glock 26, which was getting intermittent failures to fire.
Taking it to a table after the range we field stripped it and I asked if they’d ever taken the striker out. The owner had never gone beyond a field strip to clean for the entire time they’d owned it and didn’t know how to get the striker assembly out of the slide. I did and found it and the inside of the slide for the assembly absolutely caked with however many rounds worth of brass shavings and gunk buildup. Some diligent q-tip cleaning later to get all the brass out and three quick mags to do a confidence test and it seems all is well.
If you’ve got a striker system, treat taking the striker assembly out as a normal part of cleaning.
Beretta 92, I’ve never pulled the firing pin out and I’ve been over 5k rounds on it, though that was between two different slides. I’m pretty sure it involves several roll pins and pulling off a number of other parts, including the safety levers, so I haven’t bothered yet.
Some solvent, compressed air, and a quick prayer to the Omnissiah should hold me over.
I think hammer fired guns are less at risk than what I saw with this striker just based on how force is applied to fire. I think it needs quite a long span of gunking up to happen with a Glock, but given how easy it is to pull the striker out it makes sense to clean it out.