People are weird about malz. His design gave him the same weaknesses an assassin (artillery mages and tanks), but specifically counters assassins, skirmishers, and divers.
Good in a 1v1, but kill potential fell of exponentially as you increase to a 2v2, 3v3...
Now the new malz has a whole bunch of problems because they tried to turn him into a swain style of burn combat mage, but retained many of the mechanics that buffered him as anti-assassin. It'd actually be easier to solve the problems that malz causes if they were to just revert the whole rework and start from there... Even after a full year of throwing darts to see what stuck, they still can't reasonably fix the problems that they created in their poor attempt to solve the problems that they exaggerated leading up the MYMU.