IMO, it is idiotic to nerfing or removing choices from everyone else just by looking at a few player's style of playing. As of me, AT are actually able to slowly wear away AI worlds one or two hops away, but, not further, not on large fleets, and not on high level worlds. At the same time, my semi-low AIP assassin approach won't even work at all without some ability AT provides (i.e. cloaking, instant unload). Yes, I have not finished a single game yet, but I don't think I can win any game with just AT, but I still like them.
Critical Thinking time:
Players who like one approach is much less likely to complain than players who don't like an approach, and are thus much more visible to the outside world. If all the devs are the complains, and then they nerf the options, then the invisible players who like those approach are hurt much more than the complaining ones.
Maybe fixing bugs about AT, or slightly adjusting their abilities or cost are fine. But, I think nerfing too much will at least make me struggle quite a bit in fleet combats due to the low ship abilities resulted from the low K coming with the low AIP.