How is that possible that I created like 100 questions on SO/SE over years and 90+% of them weren't closed/marked?

Im that lucky or people tend to do not care about quality of their questions and then cry about how SO is bad?

Maybe you have better communication skills than average, happen to include enough code so that people know you are putting in the effort.

IME down/close votes have at least as much to do with soft skills and English proficiency as quality of the underlying question.

Did your questions fit in a pattern of questions that SE fails at, or did they have straight-forward answers?