Linux is not «very poorly supported».
There are hiccups with exotic hardware sometimes.
When you're buying stuff that might not be «plug and play» with all the things going on behind the scenes (i.e., a bluetooth keyboard or a soundcard), you might want to stick to the most well known brands (for a keyboard, Logitech, HP, Dell, Lenovo, Corsair, Razer etc...) and figure out first online whether someone has already dealt with it.
If there are 95 people around the world running some piece of hardware, devs might not bother writing a driver for it.
My soundcard, an exotic one, has only been decently supported by the kernel for about a year. It was a bummer, especially since a revamped model came out a few months after I bought it and was usb class 1 (= supported out of the box on Linux). Had I been running Linux at the time, I would have bought something else I guess instead of having to boot the annoying operating system every time I wanted to use it.
Anyway, if Linux is your thing, check online first before buying new hardware.
There are people here every week complaining the newest disposable laptop with Celeron + soldered ram + «slow» emmc doesn't work properly when they could have bought a powerful and maintainable refurbished business laptop perfectly supported on Linux for the same price.
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