Well, that’s why passive perception exists. But you still need a skill for resolving active attempts to search for things, and it makes sense for that and passive perception to key off the same stats. Unless we want to go back to the days of separate skills for search and spot? That seems like a poor choice to me personally.
5e is a little ambiguous on the differences between investigation and other skills.
"Investigation. When you look around for clues and make deductions based on those clues, you make an Intelligence (Investigation) check. You might deduce the location of a hidden object, discern from the appearance of a wound what kind of weapon dealt it, or determine the weakest point in a tunnel that could cause it to collapse. Poring through ancient scrolls in search of a hidden fragment of knowledge might also call for an Intelligence (Investigation) check."
So is a hidden trap a hidden object that you can find with investigation?
Wouldn't the wound thing be a medicine check?
Would researching knowledge be a specific knowledge skill?
But then there is a whole sidebar on finding hidden objects
FINDING A HIDDEN OBJECT
When your character searches for a hidden object such as a secret door or a trap, the DM typically asks you to make a Wisdom (Perception) check. Such a check can be used to find hidden details or other information and clues that you might otherwise overlook.
In most cases, you need to describe where you are looking in order for the DM to determine your chance of success. For example, a key is hidden beneath a set of folded clothes in the top drawer of a bureau. If you tell the DM that you pace around the room, looking at the walls and furniture for clues, you have no chance of finding the key, regardless of your Wisdom ( Perception) check result. You would have to specify that you were opening the drawers or searching the bureau in order to have any chance of success.
And then in the DMG under traps:
A trap's description specifies the checks and DCs needed to detect it, disable it, or both. A character actively looking for a trap can attempt a Wisdom (Perception) check against the trap's DC. You can also compare the DC to detect the trap with each character's passive Wisdom (Perception) score to determine whether anyone in the party notices the trap in passing. If the adventurers detect a trap before triggering it, they might be able to disarm it, either permanently or long enough to move past it. You might call for an Intelligence (Investigation) check for a character to deduce what needs to be done, followed by a Dexterity check using thieves' tools to perform the necessary sabotage.
Any character can attempt an Intelligence (Arcana) check to detect or disarm a magic trap, in addition to any other checks noted in the trap's description.
Rulings, not rules eh?