It’s probably getting more rare as hardware gets more complicated.

You can barely get modern computers to boot without some proprietary blob. MINIX was a great stepping stone back in the day, and ran on plenty of hardware.

I have a sweet spot for MorphOS in my computer collection.

I do love bare-metal programming, but it just isn’t feasible for wide targets like modern machines. I guess the next best thing is writing virtual machines for my own needs.