Star Bases are nothing that a squadron of Carrier Cruisers loaded up with bombers can't solve.
In retrospect I think that Vanilla SOASE just offers a different mode of play for MP. Without the Entrenchment features you really have to rely on your fleet to both attack and defend, and doing one will leave you weak in the other, it's more 'active', yet also less complicated (incoming flame detected).
Entrenchment is a longer term and more strategic (as opposed to tactical) mode of play, that allows for opening up multiple fronts of battle and either defending or conquering them simultaneously. Vanilla is a matter of harassing and out-flanking your opponent.
Vanilla is like playing a medieval battle... skirmish, harass, lure, and charge the ranks in when the time is right.
Entrenchment is like trying to manage both the Atlantic and Pacific theatres of WW2 at the same time.
Diplomacy will be great... it will be the above description of Entrenchment while trying to placate allies and manage domestic strife, while organizing espionage on everyone, lol!
-Itharus