I'd previously tried out someone else's 2016 MacBook Pro with the first generation butterfly keyboard. I actually immediately liked the new keyboard and knew I'd get used to it almost immediately if I ever switched.
10 days into my 2018 MacBook Air ownership, I started experiencing "sticky" keys with characters repeating themselves and/or not registering. This was on a brand new computer that had always remained closed when not in use and hadn't even moved from my desk.
Luckily, I was within the 14-day return period and I was able to walk into an Apple store and swap out the defective unit for another new MBA that (so far) doesn't have the sticky key issue.
I am now close to the end of the return period for my second MBA and I live in fear that the issue will present itself and I'll need to be without my computer while some Genius Bar employee tears apart my brand new $2,000 laptop and follows some mitigation procedure that is not guaranteed to last long.
I believe Apple has the resources to make this keyboard mechanism work but has not allocated those resources appropriately.