I had speech therapy in elementary school. 4th grade I think. (Definitely 4th, 5th or 6th, because it was at the school I went to those years.) I don't remember (if I even knew) why I was sent. What I particularly remember was being taught to open my mouth big when talking. I don't have a lot of memories of it. My childhood memories in general are somewhat scant.
I don't honestly know how much it helped me as far as conversational speech. I've no point of comparison.
I'm a lector at church -- reading bible readings, prayers, and announcements to the congregation, with a microphone -- and I'm quite certain it helped me with that. I think that the speech therapy I had as a child is why I'm one of the better lectors. The skills I learned in speech therapy are ones that are used even more so in speaking to a large group. In particular, articulating well.
On the other hand, in church choir, I had to learn to open my mouth tall instead of big. Like a zero (0) instead of a circle.
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not aspie, not NT, somewhere in between
Aspie Quiz: 110 Aspie, 103 Neurotypical.
Used to be more autistic than I am now.