It's less about exhaustion with the genre and more about being exhausted with the f2p model. Especially with games like Overwatch where this is a new thing. The core gameplay mechanics of Overwatch are fine, minus the constant changes to larger mechanics like team composition and role changes. But as a FPS game there is nothing objectively wrong with the game from a gameplay standpoint. It's fluid, easy to learn, and responsive. Same with games like Apex. There's nothing objectively wrong with the gameplay. But they sacrifice server stability and game breaking issues that have been present since the game was released in favor of adding more ways to spend money. If anything these issues have gotten worse while the shop looks more complicated and predatory than Fortnite's in its hay day.

I know Concord isn't the next big thing, but I think it's worth a try. $40 is not even that much when you consider how much f2p games are charging for their skins. And I'd much rather pay $40 for a game and have minimal microtransactions than play a game for free but have to spend even more money than the game is worth just to customize the huge roster of characters these games have. And the argument "it's just cosmetics" is such a lazy excuse when customizing your character is one of the only ways to express yourself in a game. It's the reason why there are so many jokes about people saying the first 10 hours of a new game they bought is spent customizing their character.

Sorry, I went on a bit of a rant and didn't mean to. Got a little carried away. I'm not trying to say your point is wrong, just that that's not the reason I'm exhausted with hero shooters.