I've missed the old days where you had to predict a time for needing to land an interrupt, instead of just smashing away at your DPS bindings and then hitting interrupt when the bar shows up. I think it has been way too long without the GCD though, and people are probably way too used to being able to just button smash already. I think it's an improvement to mostly PvP, because being able to use like 4 DPS CDs in an instant while buttonsmashing allowed for some really dumb and insane moments where you could barely react. Especially stuff like fury warriors or rogues using everything at once, cds, smokebomb, cloak etc.
Overall this will seperate good players from bad big time. I understand the frustration of having to wait 5 seconds to DPS because you are popping like 4 DPS CDs though.
Maybe this GCD thing will help situations where DHs pop everything and do 500 million DPS on a trash pack in mythic+, meanwhile the Shadow priest has managed to cast 1 SW: P.
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Yeah, it's impossible to imagine a world where everyone doesn't enjoy going at sonic speed /s