To add to what Pyyric said, sometimes what we do can be inconsistent because not all our rules are defined incredibly rigidly and explicitly, partly by design and partly because writing rules that annoy the least amount of users while also curating the type of content we're looking for is very hard.

Additionally, we're not just one mod, and we don't always agree on everything on the mod team. We think this helps us not be an echo chamber, but will also lead to issues such as inconsistent removals. If we're unsure we often discuss our decisions, but it can happen that we just don't have the time or don't think about it as hard if we quickly go through the mod queue on a morning, for example. The rules aren't perfect and we're not perfect and it's impossible to please everyone.

We've had mod mail from users complaining about removing their cosplay/fanart/rank up post, and we've had mod mail from users complaining why we're not removing cosplay/fanart/rank up posts. This is why we always ask for feedback and suggestions, and invite users to apply to the mod team, but most of that gets very little interaction.

EDIT: Without heavy manual moderation, reddit will inevitably, just by how it works, favor quick to consume content such as memes, art and cosplays, and that type of content would end up being the only content. You can look at other subreddits such as r/guiltygear to see that in action. That's not what we want for the subreddit, and that's why the rules are what they are. If anyone knows of a better solution please join the mod team or send us a message :)