Friendly note: I think you should be happy that they upgraded you to a 2019 model without charge, and not expect a similar upgrade to a 2020 model. Best of luck with your new MBP.
I strongly disagree as the keyboard should have been reliable from day one. The Butterfly Keyboard wasn't, Apple cut corners during the qualification, allowed a poor product to market, then deliberately ignored it's customers for as long as it possibly could.
OP should push for a notebook that works as advertised, not accept one with a recognised design flaw that will repeat over time, ultimately to the customers cost. Apple proport's to design the best, therefore Apple needs to step up and provide the same not keep excusing itself.
OP Have at, I would, you owe Apple absolutely nothing, inversely Apple owes it's customers everything, something it's long since forgotten...
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That sure would be cool, but sets a terrible precedent for their bottom line.
Had my way Apple should be compelled to replace every single one of these defective Mac's, then and only then will Apple stop cutting corners at it's customers expense. The 15" MBP has had so many design related issues over the years it's beyond a joke...
Replacing the same defective part over & over is hardly a solution, equally see just how the price of the 2016-2019 Mac's bomb as Apple closes the extended keyboard warranty. Ever more for the landfill...
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