DrJawaPhD
Hero
No one is talking about using Mage Hand to disarm traps or pick locks, we're talking about Mage Hand purposely blowing up traps since it can't take damage. This isn't always wise, if blowing the trap would destroy something valuable. Also as noted by someone above, it's not particularly different than using a long poleThat hits on niche protection: there's a feature that exists (AT's Mage Hand Legerdemain) that specifically allows you to use thieves tools to disarm traps and pick locks with Mage Hand. Allowing mage hand to do so without that feature buffs the cantrip greatly, and invalidates a big feature of that subclass.
Whether this is overpowered or not depends on the playstyle at your table