Personally all I care about is keeping my ingame account seperate from my forum account. I should not have to worry about something I post on a forum having any impact on my time ingame at all.

For those that care about privacy for something they spend quite a lot of time on having your account and server name clearly visible means you can use FFXIAH/google to get a lot of information about them, posts on a forum make you care enough about someone to do so. From ffxiah you can find out a lot about their character, what they buy, friends, gear etc, ingame you know exactly who they are and what they are doing, hell if you want to get really far into it you can search with google and find linkshell applications (that very often include rl information).