Bungie's position is a tough but understandable one. The only way to play Destiny 2 on SteamOS requires you to bypass their anticheat, which is OBVIOUSLY not allowed. They can't change the situation, because they're not the ones who make the anticheat, they use BattlEye. While BattlEye does have anticheat products that do work on Deck, their most secure stuff is currently not on Deck. I foresee this being the Deck's biggest challenge, as many AAA games and especially multiplayer games requiring anticheat to work. Until Valve can get low level anticheats working on Deck, this block is gonna be the biggest roadblock to widespread adoption.