BombOmOm

Some games that make for some fun coop and don’t require a ton of screen time. All of these are at least gold rated on ProtonDB so should be fine on the SteamDeck, though I’m not sure about crossplay with consoles on any:

• Sanctum - An interesting combo of first person shooter and tower defense (Sanctum 2 was also real good)
• Borderlands 1 - Looter shooter with some solid humor (Borderlands 2 was also real good, but goes downhill in later games)
• MechWarrior 5 - Who doesn’t want to be a giant mech riddled with guns?
• Left 4 Dead 2 - Fight together to escape zombies, or in multiplayer servers work together as the zombies to take out other humans

Now, less of a focus on shooters:

• Golf It and Golf With Your Friends - Put Put golf taken to extreme levels
• Magica 2 - Murder enemies together in a top-down wizard game
• BattleBlock Theater - Jump over obstacles and solve puzzles together

Personally, I use TVs as a simple screen and watch everything through other devices (Roku, or a Linux PC running MythTV).

This would be my suggestion. Get a mini pc or dongle and use the TV simply as a display. Internet connected TVs are never well supported.

Also, highly suggest disconnecting the TV from the internet. They don’t get security updates and they are notorious for spying on people’s viewing habits.