That's the benefit of a broad diagnosis. Narrow diagnoses make it hard to get specific treatments for problems.

That's my main concern about trying to split up autism. It's all well and good for study purposes, but for "can I get my insurance to pay for my kid's occupational therapy" purposes I'm really skittish about such a breakup. All the sudden my kid might have "omegaism" or whatever and boom, it's uncommon for them to need OT so insurance won't cover it.