I'm here to third this assessment. The feel of the butterfly switch is so much better for long bouts of coding/typing and, in my particular case, improved accuracy.

I think the issue is that the scissors switch encourages typing using the tips of the fingers (deeper key travel) whereas the butterfly keys encourage using the pads of the fingers which reduces exertion and fatigue.

My understanding is that the failure rate for the butterfly keys is "significant [...] but 'less than 5% for sure.'" [0] Marco Ament (thread OP) and John Gruber (Daring Fireball) are proponents of keyboards that take more effort to use, Gruber's favorite keyboard being the Apple Extended Keyboard II. [1][2]

Some aficionados' opinions about keyboards reach heights usually reserved for out-of-production American muscle-car transmissions. [3] Reading the tenor of some descriptions of the action of these old-timey keyboards, e.g.

  > tank but with a more metallic, punchy feel, and an audible note to its
  > astoundingly loud typing sound, [3]

one can practically feel the adoration of these self-identified keyboard nerds for a particular type of vintage keyboard.

I personally prefer subtlety and finesse when I interaction with peripheral devices, so I welcome the move toward shallower key travel.

YMMV

  [0] https://theoutline.com/post/2402/the-new-macbook-keyboard-is-ruining-my-life
  [1] https://daringfireball.net/linked/2012/04/16/my-favorite-keyboard
  [2] https://www.flickr.com/photos/gruber/sets/72157604797968156/
  [3] http://www.penmachine.com/2008/04/keyboard-nerdery-apple-extended

EDIT: spelling, punctuation, capitalization, modify adverbial phrase, add adjective.