MTA is a bet for the future, he is barely 18 years old and has a lot of projection for the coming years, in addition to being a player who grows in the most important rounds.
In addition to this, Heat never adapted to his role as initiator, he often died with the utility, he did not enable his teammates well, etc. He hits a lot of bullets, but his role requires being good with utility and no matter how much firepower he has, it doesn't cover up that shortcoming.