I see where you're coming from with regard to the CZs.
There is a good reason for it, however: It's down to how the game works - the background simulation (BGS) works by summing all activities over a 24-hour period and calculating all influence, state and conflict outcomes over that period. Think of the BGS as an asynchronous turn-based strategy game and it makes more sense.
Programming it this way means that even players who can never meet in-game, such as Xbox and PC players, can still compete for control over a system - all the platforms feed data into a single BGS. It also means that solo and private group players can contribute to a strategic goal without leaving the mode of play they prefer (or, indeed, might have to use - my mum's internet connection, for instance, is really flaky, and solo is the best option sometimes if there's a lot of contention on the line.)