The sale success of the Steam Deck proves you wrong. The PC is the strongest platform for exclusives because most of everything ends up there eventually. The Xbox has no exclusives anymore, Sony is publishing everything on PC eventually. Only Nintendo remains as never publishing on PC. If you are flexible about your choice of multiplayer-only titles (if you're even interested in that type of things) then the Steam Machine is the best console.
Sony's in trouble; their crown jewels are all on PC right now! You can buy a Steam Machine next year and play all the Spider-Mensch, the Lost Hose, the Ghouls of Yo-Kai!