Should I buy a used Steam Deck for Forza Horizon 5 and potentially FH6?

I'm a recovering Xbox gamer who grew tired of the monthly cost for the ability to play my purchased games online. Purchased a pre-built gaming PC …

The Steam Deck (and by extension any handheld) isn’t particularly great for 3D games due to the power limitations. Those games do generally run, but they either need lower resolution or lower framerates, and almost always drain the battery faster.
I’ve been okay with games that released targeting the PS4 generation, which is still a very wide net including many games released in the last few years. I finished AC: Odyssey on my Deck for instance.