[GlennS]

I don't think it's deliberate gatekeeping.

In the process of learning a tool thoroughly you forget what it was like to not know how to do it.

So, it becomes hard to write a good beginner's tutorial. And you forget why the things which help beginners are useful, so they just look like clutter.

Personally, I don't think that 10-15 minutes reading the Emacs tutorial is much help to anyone. However, I am glad that I have spent the past few years learning how to use Emacs (and I haven't even learned elisp properly yet), and grateful to the people who made it and all the great software around it.