Obviously the Klaestron people didn't care about Trill customs but it would have been useful to the Bajorian court instead of Sisko trying to explain his "new friend" as this issue has been explained by the Trills a long time ago. Everything that our heroes did to explain a Trill person should have been easy using information from Trill and Tandro could have spent his time trying explaining why, possibly centuries old, information about how Trill individuality is wrong.