This is based on my alliance's experience in Vale of the Silent. Aegis Sov requires tedious PVE grinding. It requires the defenders to stand post for hours in order to respond to someone who will most likely run away and avoid a fight, if you actually respond. The balance is off, since the offense does not really have to commit anything to the fight in order to threaten space.

Grinding up defense indexes is a tedious activity. Eve players consistently complain about the boring monotony of running anomalies and mining for hours on end, but that is exactly what Aegis Sov requires. My alliance now has mandatory fleets for ratting and mining. This has been very bad for morale and has resulted in decreased numbers in corp chat and on comms. Part of this may be bitter vets being perverse: some of the same people who refuse to join mandatory ratting or mining fleets are the same folks who complained about mandatory structure grinding fleets in the past.

Actual fighting under Aegis Sov thus far has been limited to the normal small gang skirmishes against the usual suspects (e.g. good PVPers like Chessur visiting through wormholes). These are the same fights we would have had before. Almost none of these fights were caused by Entosis, or even the threat of Entosis. We would have gone out to fight these people anyway, because home defense fleets are fun.

There has also been a certain amount of chasing away trollceptors - who are not looking to get into a fight or even provoke a fight. They burn off at a high rate of speed as soon as you respond.

In one case, someone did actually Entosis something to the point that nodes spawned. No fight came of this, since the hostiles never came back. It just turned into a waste of time as we went around looking for the nodes and turning them off without any opposition.

If someone made a real push for another person's space, brute force and numbers would win the day. Aegis Sov comes down to knowledge of game mechanics and N+1, just as with Dominion Sov. I do not really have a problem with that.

In a fight between two evenly-matched groups, however, content denial is still the best strategy for contesting sovereignty (just as it was with Dominion Sov). Repeated harassment, followed by blue-balling, followed my more harassment, until they just stop logging in is the order of the day. Harass the defenders by using an Entosis link somewhere in their space. In an Interceptor, you can have an alt do this while you do something else. If they respond, burn off at high speed. You literally cannot lose your interceptor if you are paying attention. If they do not respond, then you just caused them an obnoxious number of nodes to spawn. They are forced to commit several times the effort now, or risk losing something nice. If you give them the satisfaction of a fight, you are doing it wrong.

That is why I believe Aegis Sov is a failure thus far, because it does not lead to more fights.