Runs great on my 2014 MBP.

AFAIK dual-display over thunderbolt is just not working very well for example (there are issues when going to/back from sleep). I've tried switching to Linux on my 2013 MBP for a couple of weeks, and gave up.

yeah no shit, apple only wants you to run macos on their hardware.

Directly from Apple’s support page.

“Install Windows 10 on your Mac with Boot Camp Assistant”

https://support.apple.com/en-us/HT201468

Has Apple ever officially stated that they support running Linux on Macs?

Well you did say ever....

https://en.wikipedia.org/wiki/MkLinux

Huh, TIL.