Not saying that the maneuvering logic can't be improved, but this is kind of an edge case here when the frigates' available options are limited by other frigates in close proximity and constrained by the short weapon range.
No, that's really not the case. Well, it will definitely happen sometime, but it is not the issue I am talking about.
There are plenty of cases where there are no ships next to the ship that starts blocking. E.g. it may be moving to avoid incoming fire, but it could have done so away from line of fire instead of into line of fire.
I'm also taking about the case where the blocking ship is not actually firing on anything.
I'm also talking about the case where the blocking ship is blocking, and moving parallel to your line of fire, when it could instead have been off to either side by one ship width and then move parallel to your line of fire towards or away from the target.
I'm talking about the case where 1-2 ships are engaging the same capital ship, but they place themselves to block your line of fire instead of being off to either side or behind the target.
And yes, I am also talking about the case where 6 Brawlers are actually engaging your target, and are filling up all the space around the target. So there's nowhere else for the Brawlers to go you might claim. My point is that for the 1-2 ships that are in your line of fire, never engaging in the first place, and/or disengaging and going anywhere else on the entire battle area would be an improvement, because replacing 2 Brawlers shooting at the target with 1 Paragon shooting at the target is a big improvement.