Broken game dynamics
Slow kill ratio along with useless PJIs makes impossible to defend anything. - Simply because fleets can fly right to core systems practically unharrassed. This creates the situation where you can simply spam siege frigs in large quantities and win just by destroying worlds one by one.
I found after a while that the fastest way to win is siege frig spam due to this feature. I tried various apporaches but siege frig spam seem superior to anything else- once you get to 20-30 of them
I think kill ratio should be sped up dramatically and PJI needs to do at least 2500% slowdown to be of any use .In beta pjis completely stopped jump and that was never really a problem for big fleets -they could destroy pji pretty fast, but this was stopping tactics like siege frig spam.