Morkus from Orkus
They can't put in spells that stomp on other classes just in case that class is missing from a party. If they did you'd have a lot of instances where there is a rogue in the party and the cleric took find traps.What if there's no rogue in the party?
The better design is to not create things that step heavily on the toes of other classes. Minor toe stomping is fine, but find traps doesn't work as a minor toe stomp.