
Grom is the one brawler that can be justified for a movement speed buff
Tl;dr - Grom is a balancing nightmare for the whole game. Hes so strong in the mythic legendary level yet remains unviable in competitive. Theres no way to buff Grom to really change that except movement speed.
Grom has a fundamental problem that cannot be solved with stats. I can understand why Adrian would nerf Grom, Grom is already useless in competitive so its not like nerfing him would make him any worse but it could make him less oppressive for the majority of the playerbase. I'm however not a fan if the way Grom was nerfed, he is more dependent on a star power that in hindsight makes him more of a noob stomper and it makes his already questionably designed star power foot patrol weaker.
Speed is a very powerful mechanic for the whole game. If your damage is high, it doesn't matter if your shots are easy to dodge for the pro players but for those who can't it the brawler becomes useful for those players. Speed is more consistent, if a brawler is fast it makes it harder to catch them for pros just as much as casuals and mid rank players. Grom wouldn't fold as badly against aggression and possibly do something in competitive with fast movement speed. Theres just no other way to buff Grom that would make him significantly viable in comp without being anymore oppressive for the rest of the game.