I just read Monte Cook's first Legends and Lore article from last week.
There are some things in D&D that simply do not require quantification. They don't needs ranks, they don't need rolls. Fight the impulse to quantify everything.
Searching for treasure 'n' stuff is one of them.
Creating (continuing with) categories like passive and active perception is a pipeline to nowhere.
Don't kill role-playing in role-playing games.
That is all.