no more switching between conj and thurm every 10 min to regain full MP.
Yup. As a recall (and I may be slightly off with this), but there was a time either during OB or around retail launch where it triggered the cooldown on those abilities when you changed classes. A lot of people complained that it wasn't fair to casters because not only did they lose MP when they changed classes to one with a lower MP pool and then back (ie. Conjurer -> Miner -> Conjurer) but it also reset their MP regen cooldowns. And I agreed that it wasn't fair. But in common fashion, SE gave people an inch and they took a mile. People abused the shiny so SE took it away.