> that can run pretty much every widely available open source operating system.

That's just not true, though. Here's a git repo listing what works and doesn't work in Linux for all of the macbook pro models since 13,1 (released in 2016): https://github.com/Dunedan/mbp-2016-linux

You'll notice that power management (suspend/resume) doesn't work for any model, wifi only works for a few select models, and support for audio is pretty spotty. If you buy Mac hardware, you're pretty much locked into MacOS if you want to have a reasonably acceptable experience.

BSD support is much, much, much worse--it basically doesn't work at all for any relatively recent model.