I respect your opinion but I've never understood people who share your opinion. If you don't like tripcodes then don't use them. If someone else feels they need to use one then that's okay.
I sometimes feel that tripcodes are necessary in situations where the "ID" feature like we have on this site is not used/implemented and the person has multiple posts that need to go together. It's nice to find a decent post that's long and interesting but it's hard to follow all the thread authors' posts/comments on the thread when trolls are chiming in too.
So in situations like the above example I like to have tripcodes available to allow the thread author to communicate everything they have without trolls messing up the conversation.