Unmedicated ADHD more disabling than autism?

I read an excellent study once that explained quite well how autism + ADHD combined are what's responsible for the constellation of disabling symptoms most of us experience. And that autism on its own without ADHD doesn't actually present as clinically disabling; ADHD without autism does, but in a different way. And the combination also looks different depending on which one is more 'dominant'.

It's a fascinating study, if you're ready to have some assumptions about how this particular intersectionality works, challenged.

ETA: forgot to mention the most important tldr; that ADHD is supposedly the determining factor for severity of symptoms, not autism.