So I've been using my steam deck as a laptop replacement as I'm on uni and I don't really need that much processing power on me.
If you have a good dock, some accessories and a lot of patience, it can fit the bill.
I've switched my system over to Bazzite, which is amazing because it's more up to date, and makes using the deck as a desktop very enjoyable, but it is running on the latest beta so any bugs that are on steamos 3.5 will persist here. However unfortunately it doesn't support HDR at the moment.
Even without bazzite you can easily use it as a desktop, but you do have to be aware that it isn't as strong as some laptops nowadays. (of course you could always remote connect to a desktop and do stuff there but yknow).
i am obligated to say that the publishers screwed over the devs for that game, so if possible you're better off getting a cd key than supporting those thieves
but convenience is convenience