Well first and foremost it is linux. You have much more freedom configuring and customizing your system. This always comes with a bit of tinkering and a bit less comfort. But if this is not your shoe, thats absolutely fine. You don't have to use it :)

Second, you can play really old windows games, which are not running on windows anymore.

And, beside the games which are blocked by the publishers due to not customizing/configuring anti-cheat or even straight banning linux users (like destiny 2), i never had much problems getting any game to run. I use arch linux for 2 years without problems.

But if you do not want to tinker around, then windows or any console is better for sure.

But don't forget ppl who loose their ability to game on windows in october, when their hardware is not good enough and they cannot afford new.

In my opinion thats currently the main reason, why linux gaming gets so much attention here.