Pathfinder 2 Blog: Critical Success and Failure

[Zanos]

They're still utility mate. Just not unimpeachable anymore. So that detect magic can still be used to spot somebody who is polymorphed for instance, or to identify a magic item or an active spell - but auto-spotting illusions and magic traps are out now, you'll probably want a rogue for that if you want to save your higher level spells. (Oh those poor dirty mundanes, expecting to be valuable and all, how dare they.)

Expect Detect Magic was never unimpeachable, since it takes three rounds of focus, can't penetrate all that much material that traps are usually behind, and can't actually do anything about the trap other than tell you that there is magic there.

Yay for solving problems that don't exist? But if it did, the wizard could just heighten the spell and invalidate the rogue anyway.