I'm surprised that more sophisticated management of supply lines never seems to have caught on much in RTS games. The basic practice still seems to be that logistics are handwaved away and your units just spawn wherever you want (or where your factory is) provided you have enough money in the bank.
I could imagine a game quite fun where you actively have to transport troops and resources to the front and where building, running (using automation) and defending/attacking supply lines is integral part of the game. I guess the result would be something like a cross between Command & Conquer and Factorio or Transport Tycoon.
The handwaving of logistics can also lead to some surreal moments in RTS single-player campaigns when the hero characters somehow manage to bring huge armies with them wherever they go, even if the story establishes that a place is difficult to get to even as a small group.
Kudos for Blizzard and the design of the Zerg here, which turns that kind of awkwardness into an actual part of the story.