Kyle's onto something here ;).
Generally speaking, the GA fraternity believes that RA-Aus pilots are of a lesser proficiency than themselves due to a "lesser" standard of training. Be this right or wrong, the fact remains, if RA-Aus instructors do not provide training to a high level the product of their training will indeed be lesser pilots. This is not to say that some GA instructors and pilots don't leave a lot to be desired in their flying/training practises. On the other side of the coin, a lot of RA-Aus pilots and instructors are way better than their GA colleagues.
FWIW, in my opinion, RA-Aus training (regardless of types of aircraft intended to be operated) really should be on a par with the best GA training on offer, incl RTF and ATC procedures. Like it or not, many RA-Aus members want to and do fly aircraft capable and appropriate for cross country touring mixing it with GA and at times wishing to transit controlled air. If our training and qualifications could be demonstrated to be equivalent to GA perhaps some of this "them" and "us" attitude could be chucked out the window once for all. And, wouldn't airspace be just that bit safer if we all had a high level of proficiency and professionalism.
Why the heck would anyone choose to further step levels of training probably creating even further discrimination.
After all, isn't learning things aviation fulfilling and fun.
My $0.02 worth.
Paul