system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What are AT-AT’s really good for?

They’re slower than every other vehicle, have a whole lot of wasted space for the two measly cannons they fire, and can’t even stand on three legs. The only advantage I can think of is that their legs make them good on uneven terrain, but they’re always seen on flat ground anyway.
gpt
Intimidation mostly.  They are tall enough to fire over most barricades and heavy and strong enough to walk through defensive lines.  They carry a fairly large compliment of stormtroopers as well. Basically they scare anyone they walk up on and can stomp through your defenses and deploy a bunch of soldiers in the middle of your forces with very few rebel weapons able to stop them short of lucky shots to their necks or something that can disable their legs.  As far as the tarkin doctrine goes its perfectly designed.