This is pretty interesting.

I wonder why in my 30 years of lived experience (in India), I never met or heard of anyone being autistic or needing meds for mental health, even amongst the software engineers. But this seems to be fairly prevalent in the US.

It might be under diagnosis but medical services and pharma are extremely cheap and fairly competent, at least for the engineers.

May be they don't openly talk about it due to stigma.

I can't imagine what they would go through here, it's a extremely social culture where you are socially forced into group festivals, gatherings and frequent visits from relatives.

Nobody in India has mental health problems. Yep. That checks out.

https://pmc.ncbi.nlm.nih.gov/articles/PMC10438407/

It might as well be that the prevalence differs between different populations.