Store managers do make sense logically, but I’m not sure it would reduce micromanagement - it just shifts things around. Still could be a cool idea, though.
For something like a Marketing Manager, that could be useful if things get much more dynamic. For instance, marketing is very static right now, so once you reach 100%, you just set those ads to “auto-renew” and you never have to think about marketing again. However, if things get more dynamic (such as some suggestions I made in another post: Traffic/Marketing/Promotion), having a Marketing Manager would be nice.