I would not recommend it if you have access to another gaming rig.
It’s a beautiful game but it looks like a ps1 game on the Deck. You’ll really miss out on a lot of details.
It is “playable” but one of the key features of the turn based combat system is that you can Parry, Dodge, And Jump when it’s the enemies turn. You’re not going to do that very well at the <20 fps on the deck.
Even on my desktop, I didn’t get decent at the combat system until I turned the GFX to medium to get over 60 regularly
You just want to see >!spoilers!< to Robert Pattison on TV.