I have old consoles; 3 of them in fact. The original Wii, original Xbox, and Xbox 360. All boxed up in my garage because I have no use or room for them.
Backwards compatibility for the Xbox One is very nice and about half my games are 360 titles. But many (most, I’m sure) 360 games aren’t compatible. In some cases this is deliberate. I was a Destiny fan (until they removed the ability to install the Taken King update and forced people to re-buy the whole game, no thanks). When I bought the Xbox One I needed to buy another copy of the game because 360 and One players weren’t meant to mingle (presumably because Xbox One players may have a multiplayer advantage).
As for what spurs purchasing, honestly I’ve only ever bought two consoles in my entire life. One was the Nintendo 64, the other was the Nintendo Wii. Every other console I’ve ever owned was a gift. I consider myself a PC gamer primarily.
I will say, though, that every Xbox I’ve owned (which again were gifts) has doubled as a DVD player (and in the case of the Xbox One and 360 a general entertainment device) which has made them more valuable to me. Though I assume the PlayStation consoles can serve in the same capacity.
What I always found amusing about that was Sony was one of the founders of the original DVD consortium, of which Microsoft signed on later. When the next generation was being debated, Sony wanted the more expensive but better quality and higher data storage blue-laser based version. Microsoft backed the HD-DVD format which was cheaper and less risky.
So the consortium split. And Sony ended up winning the battle. Though by the time Blu-Ray came out on top, streaming was taking off. So the whole exercise was kind of futile anyway.
An interesting problem MS has with XBone, is every blu-ray based player sold gives royalties to Sony. So they had to charge more to pay off the fees.
I agree the lighting is worse (or, at least, not better), but the other stuff is so much better I think it’s better overall.
The actual underlying animation techniques are fundamentally different, from what I understand from watching stuff on Pixar. The process they showed even then didn’t look polygonal at all, and they described a lot of stuff working with curves, not triangles.