They almost never call carrying or dribbling above shoulders.
IMO, it is more about how long you carry then do you carry.
If it is like a split sec, as Isaiah does it, then it is fine.
If you are going around like a waiter, then it should be called.
In all truthiness, IT is so fast, twitchy and cunning that it is hard to be 100% sold on criteria as there is no similar example of size, skill and hand speed in the league. If there were 50 guys his size and speed, say 6'7'', 225 lbs dude, then criteria would be established more easily.
Maybe CP3 is the closest to IT in that regard and they don't call it on him.
Calling out a 2-time all-star that just had a personal tragedy for carrying isn't going to make you more relatable to the to the public or referees. Weak move by Hoiberg.