The (now discontinued) 12" Macbook was released in 2015 and used the butterfly keyboard first (it was also their first foray into USB-C). It'd be interesting t

The (now discontinued) 12" Macbook was released in 2015 and used the butterfly keyboard first (it was also their first foray into USB-C). It'd be interesting to hear how they went about determining the keyboard was solid enough to use in the Pros when it clearly wasn't, even 3 design iterations in and almost 5 years later.