5 years? So the 2014 MacBooks had bad keyboards? I had heard right here on the forum that everything up to 2015 was brought down by the wings of angels, perfect and flawless.
Nope 15" MBP has been problematic in the past, however it did present value to many profeshinals, unlike the 2016 design.
Butterfly was launched early 2015 on the now defunct MacBook, so maybe not a full five years of garbage unreliable keyboards, but not far off. The fact remains that the keyboard is a joke for any notebook, let alone an alleged premium line. Apple may have figured out the reliability with the 2019 models, equally it's likely costing them too much to produce reliably and the damage done on the PR side...
Q-6