Xbox Series S games?

I would like to get a Series S, but I already have a PC. But my question: can you really play ALL games from the Xbox on the PC? Because then it wouldn't be worth it at all.

Yes, you can.

Microsoft's goal is not to sell consoles. (You even make a loss with every console) But software and Game Pass or gold subscriptions.

No, you can't. There are a few very small indie games that are only available on the XBOX. However, they are almost negligible and you won't miss anything. The XBOX is a kind of PC Lite but really only for gaming.