Mercury switch, which is dead silent.
Very fragging annoying we have seemingly made no effort since. There's a lot of obnoxious buttons that dont make sounds, but I'd really really like actual switches that dont make super loud clacking whacks.
I replaced a bunch of switches with dimmers, and that's ok, but it seems absurd to me how obviously underserved, how unchanging the popular tactile system is. Iterate please, dont disrupt! Buttons are easy to make, but such a tactile downgrade.
Ditto for door-knobs. Maybe I'm missing something but the bolt-action klack is so loud. Cant we, like, damp that? There just doesnt seem to be a market for non-shitty house-gear.