About Auroras : Pilot is mostly correct. The unit is designed to be countered by other things than tanks : mainly bombers, and normally labs or any units that are fast enough to overcome their range advantage (like mantis). It's true that labs are probably currently lacking in strength (probably speed more than strength) in the current FA balance.
But the issue with auroras now is not that they are too strong per se but that they become slightly too strong when microed (they can even dodge labs shots easier than labs can dodge their shots = something wrong there). Before, it required a lot of care to micro auroras. Now, it's very easy (good thing, really), but it provides a huge additional strength (too good). It's normal that good micro provides an advantage, but in this case the advantage (dodging + higher hit rate than other tanks when microed) has to be tuned down a little bit. Hence no change is required to 'usual' stats like DPS, range, HP, etc, just a reduction of their advantage when microed => small inaccuracy when they move (= when they are microed).
As for fobos, the list of maps where there are too strong against Cybran and UEF is not limited to Eye of the storm or Haven Reef (they are most op there because of the cliffs from where they can attack). You have to add : Dark Heart, High Noon, The Wilderness, Paradise, Four Corners, and all similar maps because they allow a much easier early map control. Sera players only need fobos + inties to protect them from bombers in order to expand, kill engies, secure wrecks, prevent any expansion etc, and an opponent of equal skill can do nothing against that except if he is Aeon or Sera himself, or just a better player. Aeon has no problem against fobos, for sure.