>you would see it evolve over time, trying to get rid of unwanted properties (reduce weight, dimensions, loudness)That has happened, though, for those who want it. Emphasis on "has happened" in the past tense. I have used a Filco Majestouch space-saver [0] with MX Brown switches for seven years now, and I'll address each of these:
- Reducing dimensions has been achieved, but beyond completely removing the remaining eighth-inch bezel, it would have diminishing returns. I have relatively small hands, but even I remember typing on an 2008-era netbook with an 80%-sized keyboard as being an utter nightmare. If you mean vertical dimensions, I will have to simply disagree. I prefer the distance in key travel and not bottoming out my keys.
- I can't stand the loudness factor of many mechanical keyboards, and so I went with a board that doesn't produce or artificial add noise into its mechanism (Cherry MX Brown switches).
- I don't see weight being a factor at all, as it sits on my desk. Too light and it would probably move around, which is bad. Even with rubber feet, they eventually get a little dusty and allow the board to shift when bumped. Being featherweight would only lower that threshold.
[0]: For reference w.r.t. small bezel and size: http://i01.i.aliimg.com/wsphoto/v0/32216845105_1/Mechanical-...