When I was young, a massive old upright board tipped over in an old building and actually came down, rusty nail first, on my head. It hit a low horizontal beam I was standing next to and was stopped/deflected just enough that the nail only poked a small scratch in my scalp.
Kind of hard to describe, but I imagine I would not have survived that even without the nail. Still, the nail was just kind of icing on the already massively incredible event chain cake.
TV pixels were also generally not square. And if the device was a TV and not an actual video monitor (both were used with home computers), it was a little slow and blurry. And overscan existed. There's a lot of things that will be a bit different when you look at an emulated display.
In practice? Constantly changing hardware with soc vendors that publish nothing and device manufacturers that (have to) keep pushing out new models on a short cycle. Plus many of them have extra shenanigans to keep the bootloader locked so you can't install a recovery (presuming you had a working one) so you could replace the os. There are some rare exceptions, but the hardware is rare and tedious and not many people can or will work on installable Linux on them.
If you just want to run some Linux userland, there's ways to do that on top of android, though. Want to get to a Linux like system or run a program? Might be as close as installing a terminal or running adb shell.
https://sfconservancy.org/GiveUpGitHub/