"how about: After the Install-Process such a "Beginner's Menu" does exist"..."
Ha ha. I proposed nearly identical idea not too long ago.

I think it is a big task and a problem for PG music to re-structure most menus. However, A Minimalistic GUI view (I forgot what is the official name for this) is fairly straight forward as far as main page goes.

So looking at two things, your drawing /requests of this post and what is already on the plate - custom quick access menu from my screenshots that is available..I am thinking if a "custom" tab is set by default with a certain set of tools for beginner in mind, you would not have to go in deep menus for most tasks. As you would have 10 or so main functions of the program in one, visible and accessible from any point place. Of course, with ability to change / customize things at a later time as you see fit. More shortcuts with icons needed to be made...

The only thing in this case, is purely esthetics is the position of access of quick panel, which is at the right corner of the screen now, while most people would expect main controls to be on the left. But that is minor and perhaps is fixable by making a distinct single "start here" button somewhere on the left side which would host beginner, intermediate or advanced set of tools and functions.