Why not? What have SC2 bots (or their abilities) to do with chess bots?
> Why not just have a fixed pace unrelated to how long the moves "really" took to calculate, with a (no longer real time) clock shown to indicate how the machines used their allotted time?
You can't show moves that haven't been played yet, so either your pace is much too slow, or you have to wait until the game is finished before displaying it. And it still wouldn't make sense to display the moves in a fixed pace when the pace (and time pressure) is in fact part of the game (see also the recent human world championship where many blunders were often played just before the 40th move because of time pressure).