AQ10 vs AQ

I have been diagnosed so this is out of curiosity.

I scored 39 on the AQ test and 6.0 on the AQ10. The doctor gave me the AQ test so further diagnosis was quite straight forward but following the AQ10 means I was just on the boundary. Looking at the AQ10 questions I suspect I could easily have scored lower.

The choice of AQ10 seems a bit odd to me. I have quite a good imagination and like fantasy and such. I quite like the theatre but being around people is different. Is it really assumed autism tendencies mean less imagination?

So I am wondering... Are these AQ tests really relevant or just a quick and not very sophisticated way to find a way into further investigation.

I did feel bias towards types of behaviour that more recent studies say are not necessarily true in the questions.