I guess that if you are in a larger RP with more participants and a higher debit of posts, you'll like being tagged in the one post where you actually have interaction to cut on searching and reading times? Like, usually one read everything, but when I know my character is in a different place and time than others, I don't read as detailed if that makes sense. Or that's just me. 

To try and cut on notifications is the reason I went all Zelda mode and colored the names of the persons I interact with in the colour of their speech. :l