Ovinomancer
No flips for you!
The obvious flaw in game built around exceptions, while also trying to stay rules-light, is that you get weird interactions when you try to combine racial abilities with magic abilities. The fact that an ability allowing you to hide combines better with an ability that gives you advantage on hiding, rather than with another ability that allows you to hide, is very similar to the numerous instance where two sources of Advantage don't stack with each other but either one would stack with a mere +1 bonus.
Except, and here's the weird, someone hiding behind a tree with an elven cloak is strictly better at hiding than someone who is invisible and hiding behind a similar tree. Cloak guy gets advantage, invisible guy doesn't.
Now, granted, cloak guy in the middle of a stone room is screwed -- no chance at hiding, while the invisible guy still gets to hide, but it is momentarily head scratching to realize that camouflage offers a better benefit to invisibility in some situations.