Yes, dramatically.
It used to be the only ergonomic keyboard with mechanical switches was the US$300 beast of the Kinesis Advantage, but the Truly Ergonomic (https://www.trulyergonomic.com) and the Ergodox (http://ergodox.org) has kicked off a wave of next-gen ergonomic keyboards featuring column-staggering, better use of thumb keys, a wide key switch selection, and reprogrammable microcontrollers.
Disclaimer: I sell DIY ergonomic mechanical keyboard kits, (http://atreus.technomancy.us) so I'm probably biased but whatever.
There also has been improvement in the switches themselves: Matias (http://matias.ca) Quiet Click switches have the same sound damping properties as the quiet Cherry switches but offer a higher actuation point and smoother action. They have also recently developed a prototype of a linear switch.
We can (and often do) come up with much better designs, but nothing seems to stick.
There are a wide variety of Cherry MX switches and, yes, one that has a good tactile response but is also relatively quiet: Cherry MX Clear.
[1]: http://deskthority.net/wiki/File:Origbuck1.jpg [2]: http://deskthority.net/wiki/File:Mx_clear_illustration.gif
Also, Cherry is the only major manufacturer of mechanical switches in mass produced keyboards.
For that, take a look at the switches produced by Topre Corp: http://deskthority.net/wiki/Topre_switch
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-...
Some examples: two new versions of the ergodox announced more or less simultaneously:
ErgoDox Infinity https://www.massdrop.com/buy/infinity-ergodox?mode=guest_ope...
ErgoDox EZ https://www.indiegogo.com/projects/ergodox-ez-an-incredible-...
Massdrop's Infinity https://www.massdrop.com/article/the-story-behind-infinity-a...
Keyboardio http://www.keyboard.io/
The lack of innovation is a sign of manufacturers catering to the nostalgic&hipster audience who still can't get out of 1980s. Basically, every article about superior mechanical keyboards reads exactly like audiophile-targeted articles telling how vinyl sound is superior to CDs/digital.