I don't even know what it means, 25% isn't "most".

I'm pretty sure it's the opposite, and the rise in autism diagnoses is almost entirely people who overall function well in society and wouldn't have been diagnosed in the past.

So to me it would be very surprising if the ratio wasn't shifting away from serious cases of autism.

If that wasn't the case, and cases of actally disabling autism were on the rise, I'd think actual scientists would be trying to find the cause, yet all we ever hear from is conspiracy idiots trying to blame anything from vaccines to "the Jews" for autism.

That’s what I meant - the early autism diagnosis were exclusively “severe”

Only as more symptoms were discovered did the milder forms get recognized