if dispels didn’t have a CD it would trivialize a lot of mechanics. i kind of like it. it sucks when you need to dispel a lot of people, but that doesn’t happen a lot. a lot of boss mechanics have 2 debuffs on people and you dispel one and heal the other. with a no GCD dispel I guess they could just put 1 DOT on someone, but then you don’t get to effectively have any choice in deciding who that DOT is on unlike the current design where you can choose who you want to dispel and who you want to heal.
also…the CD Of the dispel wouldn’t matter…they would just design the encounters with more frequent debuffs…it’s intentionally designed so that you can’t always cleanse everyone.