> I've had it happen twice with my Intel Macbook Pro from 2015 and now for the first time with my M1 Macbook Air from 2020

> They fixed the keyboard issue with the 16" Macbook Pro Intel series, which came out 4-5 years ago.

Fixed what keyboard issue? Clearly, GP is experiencing an issue across these generations. You can add my anecdata to that as well: intermittently cruchy/blocked keystrokes on my 2020 M1 MBA, exactly like my old ~2016-2018 MBPs.