What are the reasons for not using title and designation in publications?
I suspect to some extent it has to do with the wide range of available titles and honorifics out there. Moreover, this can lead to rather strange credits, such as the German system, where a title such as "Prof. Dr.-Ing. Dr.rer.nat. Dr.(h.c.) Dr.(h.c.) Dr.(h.c.)" is not as uncommon as it should be. 

Keeping to names makes things more egalitarian. If needed, you can always look up a person's credentials. (It also helps to keep things consistent, and easier to track authors and cite papers, if you don't have to deal with titles as well!)