I personally don't fall in the category that "that doesn't like to admit" that 90% of the members who come here are Newbs to aquascaping. It's true. A bit disappointing, but true.
There's the hobby of growing aquatic plants, and there's the art form of aquascaping. You can "understand the pallet," that is have the experience of growing a lot of plants, but if you still haven't conquered collectoritis or made a real resolve to aquascape, you're still "really beginner" in my book.
That said, I think you're right that real beginner's, and not-so-beginner (who've made a resolve to aquascape) alike can learn something from reading this.
In short generalization with no real evidence to back it up, maybe the vision of the aquascaping world we're imagining is like this:
90% Newb-- (this category includes people who've been in the hobby for a week or 20 years, if they haven't made the resolve to aquascape and learned the basic skills, they're newb no matter how many tonina species they've grown before)
8% Elementary-- (Again, come from varying levels of plant growing skills, but have made the resolve to aquascape and have some understanding of the basic design ideas)
2% Intermediate-Amano
Edit: Granted, there probably is a fairly strong positive correlation between aquascaping skill and plant growing. But we probably all know a fair number of members where one is much stronger than the other (though guys with better design than plant-growing skills are pretty uncommon). Er . . . actually, off the top of my head, I can't think of ANY besides myself (I still classify myself as "Newb-Elementary" class when it comes to growing plants)