I don't know. Just that I have not experienced anything out of the ordinary with my 2017 as compared to the 2016's, and this is my 3rd nTB machine because I had 2 defective 2016 nTB machines (other issues, not fan/heat related). I also had a TB model (free upgrade from Apple), but which I wasn't happy with so I returned it (it had a whistling fan).
I feel like I hit the jackpot at least on screen and lack of fan / heating issues
My c key was feeling stuck the other day earlier randomly but sorta worked itself out for now. I recall having similar issues intermittently with my 12" mb too. I like butterfly keyboard but doesn't seem like it's gonna hold up for the long haul. Who knows thoug
Glad I have AppleCare. This generation just seems to get a lot of shade (2016 onward)
I like mine but now I'm wondering abojt things as well . Oh well
I'm NoT buying another computer in any case any time soon.