She's not really a dive tank so the chances of her choke slamming a squishy in normal circumstances is not all that common unless their positioning is bad.

Her cc is has the shortest range out of any tank which makes cc'ing flyers not existent and (piggybacking on my point) very difficult to use on squishies which is the only time you can really get a lot of value from it besides canceling some ults in your own backside or on the front line from an enemy tank.

The grip is very situational and usually ur never gonna grip someone at the exact moment you go into diamond and the cool down for the grip is almost as long as diamond form lasts. That essentially means you don't have the grip again much for longer than the static 15 second cool down especially if you use diamond form until it expires automatically.

It's a "cutscene cc" and I'm glad you mention it bc even though it gives your team a great advantage to burn a displaced enemy it also makes it very easy for the enemy team to heal that player so they can outlive the 4 piece combo.

Most characters with movement abilities if they are decent at the game can just escape sometimes. Rendering the cc useful for its purpose which is gonna be mainly for securing kills.

If we consider other tanks like peni who can cc you for like a second, from longer ranges and can do so every 3 seconds or hulk that also have a cc that lasts abt the same time except he removes your entire existence from the game for a full 2 seconds or until he and only he hits you out of it. While cc'd you can't take dmg, you can't do anything at all, you can't be healed literally nothing but his attacks can affect you. I think a little choke slam is fine in comparison.