I don’t think Twitter and Reddit are going to die quickly. They have user bases that they can monetize and bots to flood content. They were shitty enough that enough of left and gave a nice boost to federated platforms. That boost will grow every time those legacy platforms alienate their users by treating them badly. Like windows and Linux.
The messenger and stardew valley are perfect steam deck games. I suspect hades is too but I put too many hours into it on PC before I got the deck.