The problem is that if I send a bomber fleet through without the rest of my support they can be taken out easily by his fleet. A SB takes quite some time with bombers to take, depending on the upgrades + # of reppers. Ye .. I mean this would obviously work if the enemy does not have a fleet whatsoever, but he does.
Like pointed out in the OP, if I split up my fleet, they are really vulnerable due to lack of advent synergy. I'd have to take lots of causalties if I manouver a big enough fleet past those starbases. The rest can just be mopped up by his defending fleet. It also takes a lot of time to split, send and regroup. Time he uses to fortify even further.
T8 will be reached eventually, because even only 1 sb gives me a hard time if combined with hoshikos early-mid game. TEC are not exactly weak at that point I feel. I generally don't like "don't let it come to that point" solutions, because they are not solutions - it's just pointing out a design flaw.
@DouglasDr, just to make sure: I'm talking about SB's which are placed right at the entry point. If you jump in with all your shit, it's all wiped within 2 seconds before it can even move.
Starbases also generate some considerable income, so if done properly spamming them does not even cut into the eco all that much.
PS: sorry for accusing you of not reading the OP !