That would give the loyalists a clear advantage unless the rebels have a much larger force initially. Remember, loyalists can still recruit, rebels can't. That means under De-Legro's suggestion, unless the rebels have what it takes to defeat every loyalist at the time of rebellion, there is virtually no way for them to win.
Furthermore, most rebellions don't have more rebels than loyalists, but in the competent ones, the few rebels are more skilled or better organized, and are rewarded by being able to storm the capital and win. Without any advantage for timing attacks and location awareness, then in almost all cases of rebellions the loyalists would win, more so than they probably already do.