Not only older PlayStation games, but also Nintendo.
I own every system from the N64 to the Wiiu, GBC to the Switch, PS1 - PS4 and even both PSP & PSVita.
But I know that they wont work forever and that it cannot be guaranteed that there will always be 3rd party replacement parts to fix those systems.
So if possible, I'd like to avoid any further wear down and preserve them, while they are still functioning.
This is why backwards compatibillity is such a huge deal for me.
Especially because I still buy games for those systems, and games want to be played :)
I go back to Atari and feel mostly the same. Not forever but they will last a long time with a little care. I've only broken one beyond my ability to repair. As for the parts I'd expect them to be available as long as there's a market for it. Retro is big business right now. So while BC is nice I don't place a huge priority on it. It's more for those who trade everything in for the next gen. I keep my stuff because 100% compatibility is hard to achieve.