Actually, I agree with this. I just said that because I wasn't a mod and had no place to say anything. But now, I will. I think an environmental level can be anything else BUT environmental/challenge.
Why not? Environmental means that a lot of effort has gone into making the level look great, and that's one of the things the author has concentrated on while making the level.
I also find that Maze/TrickJump is a stranger concept than Environmental/Challenge, A Challenge can still be a challenge even if the level looks great, and a level doesn't lose in graphical quality because there's challenge to it.
Also, if people don't like the idea of having challenges, puzzles or mazes in their environmental levels, they should only download pure environmental.
And for those who think that an environmental level REALLY can't be anything else... then just pretend that the environmental tag isn't there when it's coupled with another. So for you guys, Blox's level is just a maze.