on paper yes, you can just throw windows on there and it will happily do all the normal PC things, and you can probably do quite a few things in the steam OC its self, watching videos email etc.
But i feel like you'll not have an amazing experience. in all likelihood windows performance will be worse than steam OS, just based on how resource heavy windows is alone. Then there's questions of driver support. The form factor isn't great for it.
Like it will probably be fine. But more of a pain than you'd like.
I think Linus from LTT said he was going to try daily drive it for a month and do a video on how well it does. So hopefully there will be a clearer picture soon enough