I can see making a Mario level with very player friendly tools because the game is so conceptually simple.
A Zelda game on the other hand is much more conceptually complex. The complexity of the editor you'll need to build a Zelda dungeon is either going to be very simple, but you then get a "shuffle the pre-made challenge rooms in the order YOU want" or maybe a mediocre maze editor, or you'll basically have to ship a copy of Godot with the tile sets and enemies and such already made.
There's also the fact that a single Zelda dungeon isn't as interesting by itself. Without the context of the overworld, the dungeons that came before, the overworld puzzles, a given dungeon is "solve a maze and fight a boss." Whee.