Here's a question for you veterans out there. I would like to know if this is even possible.
Is there an effective way to prevent an enemy fleet from slipping past your frontline planets and into your vulnerable rear planet region?
Otherwise, it doesn't seem like a good strategy to spend too much on fortifying your frontline planets. It seems too easy for the enemy fleet to simply slip by your frontline planets and attack your vulnerable rear planets, taking out military labs and frigate factories in the process.
Space Blitzkrieg is what I would call this dreaded tactic.