Its true, that being diagnosed as hypermobile, just as a label to what u already know urself. However sometimes that label is nice as it sums up everything, without having to explain to the nth dr what your symptoms are. Lots of people can do the list of things and have no joint probs what so ever.
The problem is that things probably wont change management wise. I had surgery to my knees as being hypermobile was just contributing to a list of other things that go with my knees. At present I spend half my life in physio, which helps and the worse joints in splints, which are my wrists at night. Lots of paracetamol / NSAIDs what ever ur favourite pill is.
I guess I'm a little harsh, I just live with it, but if its your knees specifically bothering u, get another opinion, as being hypermobile might not be the only problem, or it may not even be of that joint.