Per CelticSpear, "some of the ACs in the pack are purposely sabotaged", so you should mostly use the ACs reviewed here as a way to get a sense of direction in building your own AC and not as be-all and end-all setups. Those are "mass-production model ACs" and because we all know industry can't be trusted worth a damn, several of them are duds or "industrial waste", but some are two or three part changes away from being great. Ostensibly this was done to encourage you, the potentially brand-new player, to experiment and build a little on your own rather than just go "oh this is the best AC I'll main this" right out of the gate and uncritically pilot something that just has nice-looking stats. In fact, some ACs are in there precisely to demonstrate that godly stat spreads on the spreadsheet can turn out to be awful to pilot and functionally useless in a battle.
Let me know what y'all think about it.