The TOS is fine. Communicating in a dungeon is pretty detrimental anyways since people are usually clicking buttons to do their jobs. That said, I've seen people squeeze in conversation when running from one pull to the next plenty of times without issue.. Also, if you want to chat with folks, there's plenty of people to talk to in the major cities, gold saucer, etc when not in battle. You can even go to those beeskness go brr clubs that people have created. As for giving feedback to a player on their job, or handling mechanics, you're safe as long as you're not rude to them. I've given feedback to people plenty of times and I've never had any interactions with a GM. I've been a part of drama too as that's inevitable when interacting with people.