Do you like that our discussions are un-hampered by personal data?

Yep.

Do you like the idea of providing personal intros?

Nope.

Do you not want to provide personalish information for safety reasons, or because you don't think it's anyone business?

Neither. I provide my personal data on the LW IRC channel all the time. I don't see this as the place for that. I see this as the place for the sanest possible discourse, as uninhibited as possible by prejudice. I know it's a problem for me, since my memory is such that if I ever read a comment by someone and I really hate that comment, I will be far more likely to down-vote or ignore that person's comments in the future. (This just occurs with a few special cases, though, so it's not really enough to turn on the anti-kibitzer.)