If Kessler sees himself as a shooter, that is a problem. In his rookie year he was elite at finishing around the basket and offensive rebounding. That's what he should build his game around, being around the hoop and playing in a way that actually helps his team. All this shooting stuff will do is make him soft and not want him to do what he's great at. I don't care about if he has rebounders or not to help him get more shots. I'm worried about his mentality which is the thing holding him back the most.
Kessler needs to be inside the paint. I don't care if he shoots during the off season or whatever it meant that he played the right way. Gobert always shoots threes in practice, but in the games he knows what he's doing. What they do in the empty gyms doesn't really matter. My point is that we should not placate Kessler's softness. He has some great tools and ability inside the paint on offense, work around that instead of trying to build on top of his horrible shooting ability. You don't want an Ayton situation where he's physically dominant and can get any shot he wants but prefers to shoot middy's and take 1 FT per game.
It's not a problem with how Kessler spends his time necessarily, it's how he views himself as a player and his mentality towards the game.
Every player should want to improve their shooting. That doesn't mean that Kessler views himself as a shooter but he clearly views it as a weakness that he wants to improve on. You say that he needs to be in the paint but that isn't the reality of how he is going to be used. He is used as a perimeter screener and having the ability to screen and pop is very useful because the defensive big has to think twice about dropping. You bring up Ayton but I don't see the point because Kessler isn't even remotely as physically dominant or skilled as Ayton. If he had that level of talent then I would agree completely and say get his *** in the post.