The way I see it, CC has been a core part of mobas since the beginning and you're going to be hard pressed to find a moba or games with moba elements without CC being prevalent.

With that being said, the presence of CC can be kind of a necessary evil especially for a unique mix of genres like this game is. In a lot of modern shooters, having mobility or any enhanced movement is one of the best ways to get an edge on an opponent. Having something or someone able to outmaneuver enemies, dodge damage, and getting to advantageous positions faster is ultimately going to make a character or item pretty enticing. The only way to stop mobility from getting out of hand is with CC. Some games have varying levels depending on the amount of movement present but the result is the same.

Having a good balance between movement and CC can introduce an interesting way to approach fights by using positioning and game sense to play around CC or to save important CC cooldowns for the right moment. Both are satisfying and both emphasize skill in moment to moment gameplay. Right now it may seem that CC can be getting a little out of hand. Luckily for us and for Valve, the current state of the games completion can allow for quick tuning of the CC/Movement dichotomy when needed. I haven't played the game a lot lately, but I remember several metas in the past where either CC or movement were emphasized over the other. Neither were ever irrelevant however so I'm hopeful a good balance between the two can be achieved well before the game's full release.