Unfortunately games are only one part of the problem. I just tried getting some Windows software up and running on my Steam Deck and it was a hours of hassle only to end up not even working anyway.
Is Serato DJ worth investing time into? No, probably not really. Would it have been nice for it to have worked? Yes, that’s sort of the point of computers ability, to be used.
I’m glad so many games are working, so I hope more software support comes along!