A PC = x86_64 + UEFI. They are have a lot of standard components. You can take any Linux boot USB and boot almost any PC with it and at least get a console if nothing else.

A PlayStation 4 is x86_64 but is NOT a PC. Watch the Fail0ver video on their PS4 kernel port to understand how different it is.

ARM is a god damn clusterfuck of random pins soldered to random shit and every Android kernel patched to hell in non-upstreamable ways. Look at all the work PostmarketOS has to do in order to get mainline Linux to work on all the random ARM e-waste out there.

DeviceTree is a joke. Microsoft at least forces ARM+UEFI, but they have locked bootloaders and even though people have found exploits to unlock them, there's virtually no reversed engineered drivers. All those hundreds of thousands of Lumina phones? Now they're e-waste. Worthless.

Linux grew because IBM created the PC. Compaq reversed engineered the BIOS and everyone started making compatibles. Over time, BIOS and later UEFI became solid standards.

ARM may be fast, but the non-standard Basic Input/Output and device detection makes it nothing but potential e-waste.