It's the Peter Principle for laptops. Laptops are made thinner and thinner, which is always an improvement, until the point when they no longer function properly.
Fundamentally, people expect a certain amount of travel in their keyboard for comfort, and long enough battery life. Apple made a big mistake thinking these were mere "nice things to have".
In terms of battery life, I'm with you, I'd rather see Apple get as much life out of the maximum sized battery that the TSA will allow on a flight (100Wh), but I don't know that I would call it a big mistake, since it hasn't hurt the sales of the new MBPs. I think they could do that in a chassis the size of the 2012 and earlier 15" unibodies. They'd also have plenty of room for legacy ports too. Those 15" unibodies were the sweet spot for me in terms of size and user upgradability.
I tried it, the keyboard was uncomfortable, and I decided not to buy it.
It would be nice if Apple would make an international version of the 15" that has more than 100Wh!
The only keyboard (if you can even call it that) I've ever hated is the Surface Touch cover keyboard.
As long it has some type of switch (scissor, cherry, dome, etc) I don't find that my speeds are affected too much.