I wrote my Ph.D. dissertation on the 2016 MacBook Pro keyboard. It's... ok, I don't hate it, but even after years of using it, I still sometimes get this odd feeling that something is slightly off. I've never had this feeling before, with any keyboard except possibly with some of the more aggressive ergonomic keyboards like the Kinesis (and that was more of a layout issue).

There are the maintenance issues, but that's not what I'm talking about here. I did have a sticky key (after about a year), and did get it fixed with Apple's free maintenance (edit: so I'm now on the 2018 keyboard), but this feeling I've had from the beginning and still do occasionally.

This contrasts in my mind very starkly with my experience with my very first MacBook keyboard circa 2009. I'd never had a Mac before or any kind of laptop, but when I first used the keyboard I never had to think twice about it. This stuck in my memory because of how much people raved about that keyboard at the time; but I guess it's a property of a good thing that you only notice it when it's gone.