You can play Spider-Man on the Steam Deck, and it’s apparently quite playable, if one is cool with 30fps and graphics that would look ugly on a bigger screen, but then, you don’t have a bigger screen, do you?
That’s clearly a sign that games are being made with enough slack towards lower spec machines that the Steam Deck can have a bright future ahead.
And from the Steam Deck calculator, something like only 15 days of orders have been processed from my queue (EU, 512GB), with other queues having similar values.
So, sure, not that many people are using the Steam Deck yet. Not that many people have got their Steam Deck, they haven’t even processed the first month of pre-orders. I’d wait until more people have them / people give up of ever getting one / enough time passes that other PC handhelds come out with much better tech.