So I have a 2018 MacBook Air with the 3rd Generation Butterfly garbage and the "S" key just decided to break tonight. I have seen and read reports of the 2019 MacBook Pro keyboards becoming much more reliable with the new materials and the adjusted dome switch so I'm curious if anyone knows that the 2018 MacBook Air will be replaced with the 2019 keyboards or all previous generations of MBPs will be replaced with the 2019 keyboards? I know there is some limitations that make certain generations unable to be replaced due to hardware issues, but if anyone is aware of such information, any help is necessary.