The problem with "Instant OFF GCD" abilities makes combat feel less rewarding.

[Blimbeard]

Also, still waiting for those specific examples mentioned in the above post. Stop dodging and actually back up your claims.

I'd have hoped you would have been able to see the wider context of the problem, but I guess not. Here's an example

There are many movement intensive fights. I'm not at endgame yet but an example that springs to mind is the second boss in DD. In this fight a healer often has to interrupt their own casts to move out of the AOE's. The key here should be my reactions, not wondering:

1. Is the game going to actually correctly calculate that I'm out of the AOE ?
2. Will the spell I tried to cancel by moving actually cancel in time to start the next cast ?
3. Will the swiftcast i do afterwards actually trigger in time ?

I shouldn't have to wonder these things, they should just work, like they do in every other MMO I've played. That's what makes combat fun, not wondering whether borked mechanics are going to kill the tank.