I agree and think investigation and perception have a lot of potential cross over in 5e. investigation helps you find secret doors/traps etc just as much as perception, provided you have some time to look for clues. finding a trap via investigation might be dc 15, or dc 18 with perception, for example, because it should be easier to find clues to deduce there is a trap, as opposed to spotting the trap wholesale immediately. anything to balance out perception is good imo, its the top skill hands down, regardless!I'm surprised at the amount of dislike Investigation is getting. One thing I noticed in the Starter Set adventure is that Investigation is often called for when searching a room for treasure and secret doors. Perception is so overpowered that I personally plan to use it primarily for *noticing* things, but Investigation for *finding* something.
As for Animal Handling, in the Starter Set adventure there's aroom with wolves in the first goblin complex. I'd definitely allow Animal Handling as an option for getting past those wolves.