> Backward compatibility for consoles is rightly a thing of the past.

It wasn't a thing of the past in the first place really, save for a very small sliver of time where it was useful to (mainly) Sony: the PS2 was compatible with the PS to (successfully) ensure it wouldn't relinquish first place. The SNES couldn't play NES games, the Dreamcast couldn't play Saturn games, the Xbox 360 wasn't actually BC with the Xbox (it could use emulation profiles to run a select number of games, and not necessarily every variant thereof), and early PS3 were reluctantly compatible with the PS2.