You guys are forgetting that the sun is dynamic now.
Even moving it by the slightest bit would require the scene to be baked again.
You're not supposed to be using baked shadows for day cycles.
Let's say you build de_dust from Counter-Strike, set up a TDM minigame and run it 24/7 on some dedicated hoster for a month. You don't change the build in that time. You don't change the envinronment settings in that time. You probably won't even change the minigame. Or the server name. Reagardless the clients are calculating the brick shadows in real time for a month even though the build has never changed.
You could bake the shadows into the build and this way increase performance for the clients so they do not need to calculate the shadows for bricks. Clients would only need to calculate shadows for players, vehicles, and other things that move. The build does not move. Or the sun for that matter.