The driver issues I tend to have was with multiple USB WiFi adapters I've tried with my computer.

I just use WiFi tethering which circumvents that whole thing, so I can't speak on that.

I also couldn't run my TV at 4K 60hz on Linux, but I could on Windows.

This could be a few things, from the drivers to your display output configuration. I have a 4K 60hz TV that works perfectly fine with Linux, the display output just wasn't configured correctly. This is something Wayland can indirectly streamline for us in the very near future as it adds features that allows developers to better handle & support various displays.

Freesync has also given me issues when trying to activate it.

This is unfortunately an area that's all up to one entity (AMD) to sort out but they just haven't. The way they'd achieve this is straight forward on paper; they'd have to make a FreeSync standard driver and provide similar GUI tools.

don't really think I've ever owned an OEM desktop before.

That doesn't mean you're not using the components found in common OEM pre-builds.

Doesn't Windows run on other things as well besides just your typical desktop?

Not really, no.
There's Windows server but it's woefully unused and is basically dead. Why even use it when Microsoft Azure (Linux based) exists. Amongst the security issues raised by various cyber security professionals.
Additionally the driver problem is flipped in this area; I could grab just about any server hardware and it'll likely work with Linux no problem. However with Windows, I'd have to look specifically for Windows compatible hardware, as there's just not much insensitive to support Windows in the server space.
You can find Windows XP running on random legacy crap. But as of modern Windows, a Microsoft Surface and Valves Steam Deck is about as unique/exotic as the hardware gets.
Windows just isn't flexible enough to be used outside of the desktop in any real compacity and Valves Steam Deck is great example of this. The Steam Deck may have the drivers to support Windows but navigating it is a whole different story.