All castable CC's need to be removable in some way or another. They need to be changed to be of type Magic or of type Curse and therefore removable.
Castable CC's such as:
Hammer of Justice
(This does not include CC such as Throwdown or Scattershot which are applied via melee/ranged physical)
The most common argument against would be "my class needs this CC to not have a fair counter otherwise my class becomes too weak."
The above argument is NOT an excuse nor is justifiable because there are more creative and clever ways that could easily be implemented to "fix" that issue.
A common argument is "my class will be too vulnerable to other classes without it."
Again no excuse or justification.
View this webpage:
The skills listed on that webpage are examples of how a creative game designer can create ways for you to cope with common issues in ways that are creative, clever, and balanced.
All castable CC's should be dispellable and any argument against it can only be rooted in the mind of someone who lacks creativity and intelligence to create better solutions that do not imbalance the game.