If a person can take care of himself, hold a job, and generally not burden anyone else why does he need treatment? To try to make him into whatever we consider "more normal?" Just let him be who he is.

It's a personal decision. I haven't gotten a diagnosis because I've been able to hold a job for many years, and I'm married, so I'm mostly fine. But I have spent my life avoiding most human contact, precisely because I know I'm incompatible with them, and people often want to know why I never leave the house.

I don't think there is any treatment. I think it's just a set of skills that you learn in case you want to try to pursue activities that most neurotypicals take for granted. It seems like a lot of work to me, and maybe it would be easier to just let things be, as you're saying.

I know what my limitations are and I can observe others doing the things that I can't do, including my own wife, and I imagine what life would be like if I could do those things too. But it mainly boils down to having FOMO, and thinking about how much work you want to go through in order to be able to do some of the things that you're having FOMO about.

The entire point of diagnosis is because a person needs help.

The point of treatment isn't to "fix" or "make normal" someone. It's to give them the tools needed to participate.

For example, someone with autism might be more prone to having a meltdown. What therapy does is give them the tools to both identify that they are on the verge of such a meltdown and to de-escalate themselves.

The point of treatment is to help someone take care of themselves, hold a job, and generally not burden anyone. It's also to help a person feel better about themselves.

The diagnostic criteria would exclude someone from an autism diagnosis unless they had persistent deficits across time and context.

Your example person may function well within a narrow band of capability - the purpose of treatment/support is to expand that band and help maintain it. I'm not advocating forcing support on someone that doesn't want it, but I am for improving someones quality of life by expanding their choice of occupation and social environment.

Without any external support I would wake up, work, sleep, repeat. Eating? Cleaning? annoyances that just interrupt work.

I've made a lot of money doing that but it's unfulfilling and at times, disgusting.

If you want to live in a society that leaves me be - I won't starve to death but I'm never going to have a partner or a family without external services like psychology, occupational therapy, social events.

Whether I pay for these services or someone else does it doesn't matter. I want them to be available for people like me to understand that we are not alone, there's a reason we can only exist comfortably in our narrow slice of the world, and if we want to leave our bubble there is support available.

Is that person happy? Would/could they be more happy?