[microtonal]

My wife uses my previous MacBook 12" 2015. It's now over two years old and I used it day in and day out. The keyboard still works fine.

(The MacBook 12" also uses the butterfly mechanism, though the 2015 version uses the first iteration.)

[pentae]

Anecdotally my girlfriends 2015 Macbook with 1st gen butterfly switches suffers less of a problem than my MBP with 2nd gen switches