The current MacBook keyboards are quite nice, they have the same mechanism as the external Magic Keyboard sold by Apple, and they seem quite resilient. I had no stuck key in the last 2 years.
The prior model of Magic Keyboards with the Fn key use older defective dust-vulnerable switches.
Note that I bought the 2018 or 2019 model with extra isolation under the keys. That didn't help at all.
The keyboard worked perfectly fine.
I haven’t had a chance to test the 2019 Intel MacBook too much, but the M1 2020 was heavily used outdoors. I believe the M1 2020 model was the first one to get the Magic Keyboard mechanism: https://support.apple.com/kb/SP824