I would argue that remembering to press a certain button combination after X time doesn't make you good at a strategy game, it makes you good at some needless busywork the game throws at you because of reasons. Wouldn't the actual skillful part of macroing be hitting your timings, timing your upgrades, knowing when to build workers, reacting to the information you've observed and having efficient and easily defensible building placement? Reacting to the changing environment in a strategy game is what's at the core of the game, not meaningless busywork that everyone does that could easily be automated to let the player focus on the actually interesting part of the game. If someone loses some MMR points because now everyone can direct their attention to meaningful choices they probably weren't that good at playing strategy games.

A good strategy game is about making interesting and meaningful decisions to affect how the game plays out. Remembering to transform a building isn't an interesting or a meaningful choice.