My kids don’t have full language capabilities, they struggle with fixations (which means learning has to be customized to their fixations or it won’t happen), and they don’t have enough situational awareness to be safe.
So, therapies are helpful in getting them enough language to have basic needs met (and minimize behavior issues), practicing doing things they don’t prefer for short bursts and learning things like how to behave in a parking lot. We may never get to productivity or self sufficiency - we are focused on staying alive.
Probably would be - age plays into it as well. My kids are pretty impacted - minimal language, safety issues, etc. I suspect it can vary widely.