Do you already have a desktop with a steam library? I would just run a hdmi from that to the screen of your choice.
I’d wager your run of the mill, Non integrated gpu laptop could be on par/outperform the deck while gaming.
Where the deck shines is being able to game in comfort while sitting on the couch or abroad.
Do you have a problem with the spirit of this post? I doubt this is what the mods had in mind when not allowing polls.