On Steamdeck, I haven’t tried multiple controllers, but with one, it has been rather seamless for both the PS5 and the Stadia controller. They are both Bluetooth, and when I turn them on they just work. That said, the original SteamDeck(which is what I have) doesn’t support CEC or Bluetooth waking, so the Switch wins out on automatically turning on and switching my TV’s input. The OLED SteamDeck is supposed to fix that, but I’m not paying for a replacement until this one dies or a SteamDeck 2 comes along.
Financially? Yeah, AI is a bubble for sure. Gobs of money are being poured in with few results to show for it. That bubble will burst. But just like the dotcom bubble, that doesn’t mean the technology is useless or won’t change the world, just not instantly over night with a single investment, which is what the investment groups expect.