That is more of an anxiety/control thing,...it may be part of the autism condition,...maybe. It may also be cultural. It has ZERO to do with love or inclusivity. "There are no 2 person jobs.",...that's me 100%. I have built engines, I've remodeled homes, done all my vehicle maintenance,...including a handful of suspension rebuilds on different vehicles, transmission work, computer reprogramming,...I have learned how to weld, I even took the electrician's exam at the county courthouse and licensing bureau,...so I could do my own electrical work on the house. I am pathologically independent, extremely detail oriented,...all about doing a much better job than a professional,...even if it takes me 5X longer to do.My husband does things his way; he decides without asking someone else. I have wondered if he has without the intention of it hurt his parents with his adult decision making, that they have felt left out. He goes his own way. I think more in we-terms and he thinks in I-terms sometimes.
I have asked my wife, "Why do my projects include me only,...and your projects include me, as well? Do your own projects." A lack of perspective on my part, but highlights my bias.
Culturally, there are people that simply do not want other people around them when doing jobs,...others are a distraction that one would rather not deal with,...they would rather not have input from others to confuse the issue or possibly cause resistance,...they would rather make a decision and risk failure than have another's input,...or,...in my case, I've already created a vision in my head, thought it over, made a plan,...and don't want to have anyone else influencing it.
My wife always asks me for input,...and most of the time I just yield to whatever she wants. On the other hand,...I almost never ask her. I just DO.