Backward compatibility was a huge reason I got into PCs. Stuff me dad's 286 ran also worked on my 486, and even later into the Pentium III epoch.
But, that's a waning thing. And marketing wants all of it to go away anyways. So much that intel's drones are killing off the BIOS as we know it come 2022 if not earlier. BIOS is a severe impediment to improving profits.