If you have a bunch of friends that have battlefield/cod/fortnite and want to play them, they will still do so without you, or at least heavily pressure you into getting them.

I'm not sure what could that even mean from consumer pov - I'm not going to buy a platform because some of my friends might want me to play a specific game with me?

The pressure to get more games on your platform has never been as low as it is today and has never been this low on Steam itself. You could spend a lifetime with the current Steam library and never feel bored.

From product pov Valve feels very comfortable and I bet they have the data to back up this move with basically unlimited war chest. If anything I feel like Valve is pressuring game developers of these major games here - not the other way around.