Linux on Mac is not worth the effort. I ran Ubuntu on a 2011 MacBook Air and now run Fedora on a 2014 MacBook Air. There were several papercuts even with these relatively open models where it took a while to get suspend, trackpad, fan, webcam, wifi, etc. working properly. You will need to use binary drivers for the latter two features and some strange EFI bootloader. It seems that newer MacBook compatibility is worse:
https://github.com/Dunedan/mbp-2016-linux
I use Debian on ThinkPad at work and plan to buy this or a Dell XPS for my next laptop.