I don't see how 5 is too much. If you're skilled enough you'll get 0 RT anyway.
Disarm RT is the bigger problem, but picking RT needs to be addressed too. If someone's picking for exp they want to use the shittiest lockpick they can get away with, i.e. one that gives 20 second RT. Nobody wants to wait through all that, especially if they have a ton of boxes. Piercing Gaze can kind of be a workaround, but not really since you still won't see trap difficulty and it's probably a lot of mana for a rogue to keep up. That's mostly why people just use the NPC smith.