I guess I can only speak to my own experience, which is that any non-Apple laptop* I've bought in the past six or so years has had working wifi, trackpad, bluetooth, etc. out of the box when I've installed Linux on it, and this has been without doing any sort of research beforehand to make sure that it would work with Linux. The last time I tried to put Linux on a macbook was with an early 2015 Macbook Pro, which at least through the summer didn't have a working wifi driver by default on Linux. I did find a working driver that was yet to be included by default in Linux around the summer, and by a year or two after the macbook came out (I don't remember the exact amount of time), it was available by default in Linux releases.

* The one exception was when I tried to buy an ARM laptop shortly after all the news about Spectre/Meltdown came out and I was frustrated with Intel's PR response to it. I never did actually figure out how to install Linux on it due to the bootloader being locked down, but that's either my own fault or maybe the manufacturer's and certainly not Linux's.