That's probably true. Part of that is that it's only really documented in the FAQs, and although the other docadmins and I have worked on trying to make the OpenID docs more readable/usable, it's difficult work :) That and it's real hard to get site text on LJ changed. Sigh.

Also, I think it would be more of a big deal if LJ were ever to back to invite codes. Since the codes for real journals on DW are very limited, but OpenID has always been available, it means there's a huge demand for people to use OpenID on DW, and there's more information about there. Yeah, LJ doesn't do much for OpenID, but nowhere near as many people use it on LJ in comparison. Whether this is causation or correlation is an exercise left to the reader.