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It could also be related to how hard users are on their keyboards. I’ve a couple dozen MBPs deployed ranging from 2014-2017. The keyboards on newer model don’t seem to pair well with heavy (read: slightly abusive) typists. I haven’t upgraded mine :).

I've noticed similar trends. With SSDs and all metal designs with very few moving parts, I would have thought these devices would be much more durable. Instead, we're breaking the primary input method that used to work reasonably well. So much for progress...

I've personally never had an issue with any keyboard from dirt that had to be fixed with compressed air, let alone multiple.

I have had many keys spuriously not worked but compressed air seems to have solved them all now.