The whole "butterfly-keyboard-ate-my-children" thing was just a media thing. And they dropped it because a few anecdotal problems were turned into a hysteria. It was the perception that the keyboard was bad that made Apple kill it, not the facts.
There were some good articles about this hysteria, like this one:
In April 2015, Apple introduced its new Retina Display MacBook with a new "butterfly" keyboard design. Some critics didn't like its shorter key travel, but complaints really began to snowball as its mechanism was adopted across Apple's other notebook models. Today it's regarded by some as a...
appleinsider.com