Some are ARM, some MIPS, some SH, some even are PPC.
I guess the availability of Android is making a lot of "dumb appliances" run on ARM even if they don't need a screen.
But for basic dumb appliances, PIC, MSP, Atmel processors (either the old 8051 or newer archs)
MIPS and PPC are still being used only because of cost ( vendors selling other chips ). The replacement cycles is very very slow, but the trend is pretty clear.
I'm less familiar with other vendors but I briefly worked with a Qualcomm-based device a few years ago and that was also ARM.
There might be some dedicated cores in those SoCs or devices for e.g. accelerators or Wi-Fi handling. I've seen ARC there but I have the feeling these are also moving to ARM.
Personally I have plenty of arm machines. Part of the reason I switched from fvwm to cwm was because I couldn’t build fvwm on one machine and move it to the other.
In college they asked for x86 windows binaries for lots of the assignments and I always cross compiled from an arm machine (because that’s where I had the toolchain set up and didn’t feel like duplicating it on my x86 laptop.) If you feel stuck on x86 use more FOSS.
That is why a third semiconductor company (besides Intel and AMD) creating x86 chips has come into existence: Zhàoxīn (兆芯)
https://en.wikipedia.org/w/index.php?title=Zhaoxin&oldid=949...