I find the Pentastar Alignment quite defenceless when my enemies deploy the mighty AT-AT. If I am on the offensive I can still resort to orbital bombardments, but in the defensive it seems to be no match. Regardless of how many defences I build, AT-ATs steamroll everything: AT-TEs get literally rekt without even putting up a fight and LAATs are taken down in a pair of shots. In addition, despite what the unit description says, the floating fortress has not enough firepower to even dare to face them one on one - and the AI usually deploys like five of them at the same time. They cover themselves remarkably well, so ambushes from the rear don't appear to be a solution.
I ought to say that the situation feels pretty unbalanced: I lost fully defended systems with shields and turbos and heavy garrisons to just a bunch of these beasts without taking down a single one of them. I'd feel it was more fair if I had just a drop of hope of fending off an invasion on my best defended planets.
How do you guys fight off the massive Imperial walkers as the PA?
Do you see any solution possible for future releases? Like reinstating the AT-AT to the PA like in the old times (but that would make the AT-TE utterly useless) or giving them a fast aerial unit capable of outspeeding their guns and ultimately, after a long fight, take them down with the necessary support?