>In other words: get an actually Linux supported laptop for Linux.
For a lot of people the point is to extend the life of their already-purchased hardware.
That's an admirable goal, but, depending on the hardware, it can run into that pesky thing called reality.
It's getting very tiresome to hear complaints about things that don't work on Linux, only to find that they're trying to run it on hardware that's poorly supported, and that's something they could have figured out by doing a little research beforehand.
Sometimes old hardware just isn't going to be well-supported by any OS. (Though, of course, with Linux, older hardware is more likely to be supported than bleeding-edge kit.)
1. Linux isn't a panacea for depreciated hardware, and it never will be.
2. If your priority is system lifespan, you are already using OEM macOS.
Linux might work with your hardware, but it might not work well.
If your vendor is hostile like Apple, it will be hard to make it keep on working.