Think of all the sales they would lose without Last of Us Remastered, Nathan Drake Collection, God of War 3 Remaster, Shadow of the Colossus Remake and so on...
It’s sad but Backwards Compatibility is just nota smart business decision for Sony...
I make game analyses on youtube:
FFVI: https://www.youtube.com/watch?v=mSO6n8kNCwk
Shadow of the Colossus: https://youtu.be/9kDBFGw6SXQ
Silent Hill 2: https://youtu.be/BwISCik3Njc
BotW: https://youtu.be/4auqRSAWYKU