I'd like to add my opinion again regarding the phase jump inhibitors.
I agree with Cosmic_37331, they feel unfun. Yes you can scout ahead, yes you can destroy them. In my experience, the enemy will have built an inhibitor, a starbase and a few regeneration bays / retrofit whatever they're called to heal the buildings, so killing them can be a fairly time consuming task, unless you have a fairly big fleet. The starbase makes me think twice about doing anything like that. It's nice that I can scout ahead and decide to not ever jump to the planet unless I have a nice and beefy fleet.
Which leads me to the problem I have with the current phase jump inhibitors. It makes me just turtle up until I have a huge fleet and can steamroll everything. It disincentivizes doing ... anything really. Even as Vasari Exodus, which I feel like should be going out, being mobile and aggressive ... I just do not ever want to move to a planet with a starbase and a phase inhibitor, unless I'm already basically winning. This becomes even more obvious when the enemy has a sizeable fleet themselves. Every Fight turns into an all-in commitment, you either win, or you lose everything. If you have enough firepower to ignore the enemy fleet and starbase to destroy the phase jump inhibitor to be able to run away later ... you can probably just destroy everything in the gravity well.
I believe, if they were less punishing, more interesting tactical options would be available to me. Harassing a planet with planet bombers to draw an enemy away from another place, or at least force them to build more defenses around the planet. Harassing orbital structures to weaken the enemy's economy, or as Vasari to gain income via reclamation centers.
Using a Titan to harass the enemy fleet and running away, before it dies, thus forcing the enemy out of stalemate, where neither wants to attack the other's planet due to defender's advantage.
I understand, the phase jump inhibitor exists precisely to make these tactics less appealing. I believe it's too good at its job, often making me wait and wait until the enemy is foolish enough to attack one of my planets with a fully upgraded starbase and defenses ... thus giving me the upper hand. The waiting is not a lot of fun to me, I'd rather be doing something else.