Well, sure, but I happen to have two of the most popular non-chicklet style keyboards sitting next to me, and they happen to be quite noisy, especially by rubber dome standards. The MS Ergo is actually louder than my HHKB, as well as my Dell. And those AEKII rubber dampers really silence the hell out of an ALPS switch, especially if you remove the click leaf. Without the click leaf, they are essentially a linear switch, and I would assume somewhere between black and red in terms of feel. And almost entirely silent.
I haven't any dell KB at home, and the only MS one is the X6, which is really crap to type on but is waaay more silent than my xarmor (beige switches) even if compared on the silenced keys (a couple with the clear silicone o-rings, a couple with the rubber foam, a couple wit synthetic foam).
I silenced those keys just to experiment a bit: i like the Xarmor sound (more pleasant than other mechs), and I don't have a "noisy" wife.
I think that the main reason because the mechs are more noisier its not just in the switches theirself but in the whole KB construction: harder plastics, more metal, an empty space between the plate and the pcb versus the rubberdome ones where the rubber foil its a sound dampener and there isn't the empty space that act as a resonating chamber.
