I am planning to switch to PC from console

I am currently using PS4 I am planning on upgrading but there are few things that are stopping me to buy PS5

One is I couldn't play older games if it wasn't remastered recently suffered with Arkham origins and GTA IV. I hate the fact that I have to pay extra to play online. Games seems to be cheaper in PC.

I defenitely love the experience of playing a game in console but I am confused