I think GMs are given a set of general guidelines they need to adhere to and then just handle each case based on what they personally feel. Which is really really not good for a moderation team. One person's moral compass is not the same as another's. They need stricter, more specific guidelines to follow about what is and what is not a bannable offense, so that they can more accurately identify and act upon reports in a more unified way.

Like a GM finding something annoying should not instantly be a bannable offense. They should look at the situation objectively, and decide from an emotionless standpoint whether or not it's actually an offense. Because basically you can get banned for anything right now. People have gotten strikes/bans for walking through somebody's bench area in Limsa, or for using /say to talk to another player. It's getting pretty terrible.