That is most likely correct. I am guessing here.

But it is most common motivation maintainers face. Another one is some sort of "PR notch hunting".

And just because I am in maintainer role, does not mean I signed up for mentorship role. If you want proper support, I do consultations at $200/hour.

Many maintainers are unpaid volunteers!

If new people are properly (but gently) mentored, they are more likely to do things the “right way” that’ll reduce maintainers’ work from any future contributions from them.

Not in my experience. It just increases load on maintainers, as beginner moves up on complexity ladder and requires more support.

Plus it is a liability. They may get offended by something, and start a smear campaign.

RTFM is perfect solid answer. It is great repelent on drama. If you take it politely, I will even point you to specific chapters.