Being outnumbered on a shard/area is usually just an LfG group being present, or player distribution. Not an actual shard imbalance. Not an issue, because there are PvP solutions.
Being outnumbered in region however, creates X number of balanced shards and Y number of single faction overflow shards. Aoo is designed to increase X and decrease Y. It works as intended.
There are drawbacks ofc. Here’s an alternate suggestion.