You can't compare double bolt, true sight etc. with the Preserve skill. There is a very big difference between them. These skills are the support skills for certain classes. The preserve skill is the main skill for the stalker.(ofcourse with the combination of the other skills)
It is good that professor/scholar has their dispell skill! I don't want that to be cancelled. But I would suggest, if possible ofcourse, that the card that gives dispell can't dispell the Preserve skill.
*edit*
About the lazyness of dual-client. I don't think this has anything to do with lazyness. I don't like to dual-client, because I think it is unfair! I never dual-client and I never will, not even for a FCP. Because if somebody dual-clients and get buffed up and say, lets duel 1v1. Then you are not 1v1! You already buffed of your duel-client so no this is not 1v1. You already have advantage of your "party member" buff.