Realistically if you have an 18+ server then the worst kinds of players will tend to gravitate there and use it as an excuse to act negatively, while I have nothing against swearing when you remove the 'their may be children' excuse to sensor people they tend to go off the rails saying things along the lines of 'I can say what the /// I like, there are no /// children here so what /// excuse do you have to tell me what the /// to do?'.

While the vast majority of players are mature enough not to act that way my experience is that as soon as you remove 'kiddie locks' the first people to go beserk and ruin it for everyone are those above the age gate. I'd like to think the FFXIV community is mature enough not to have such individuals but the reality is that we've seen in these very forums how offensive and offended people can get and I'd rather not see that in the chat box while I'm playing.

Maybe I'm pessimistic but I prefer to think of myself as a realist.