AS diagnosis doesn't change whether you have it or not so I don't see it as a problem.
For me I'd like to be certain (or as certain as you can be) whether I have this or that.
I am diagnosed with AS but not sure if I have it tbh. If there was a way of finding out for definite, then I'd hope it turned out I did have AS. Not because I like it or want to have it lol, but because I'm still the same person regardless; having the diagnosis just puts a name to it so that you can deal with it better. I mean if you know what you have, you can do something about it.