It definitely is not (saying as a PC gamer for over 15 years). If you don't already use your gaming PC regularly for other stuff so that the whole loading, update and maintenance is part of the daily experience anyway, then, you first have to fire up the gaming PC, wait for it to load, login to Windows, then you might have Windows nagging you for an update, then maybe Nvidia gaming hub or whatever they're calling it nowadays nags you for an update, then maybe you have to reboot, then open the steam launcher, then maybe that also want some updates, then fire up the game, then you have to clear your surrounding environment to make room for the cable tether and make sure you don't trip on it, then put on the Index, then finally you can play.
To most people that wohle ritual gets annoying and puts off the casual gamers who want a quick gaming session every now and then without dealing with any of that crap. The Quest is literally just put on and go since it's just like a console, which is also more popular for gaming than PCs for the convenience and the lack of friction.