You (not just you though, I noticed many newbies presenting it that way) are talking like using a discussion forum is some sort of a rocket science, something very complicated. I mean, all that you need in order to use is to be able to read and write and that's basically it.
To be honest, it's not as easy as you make it sound if the person has absolutely no experience with forums such as this. The ability to read and write doesn't make a person understand everything they are seeing, they can't find specific sections and where they need to make their posts, they find it hard to understand the rules, and are always afraid of getting banned or blocked, etc.
I know one can learn all these things if they spend some time experimenting with everything, I have learned everything myself after joining the forum, never had someone guiding me through, I did have some difficulties initially but since I was an internet freak, I figured out everything way earlier than a normal person would do.