Well, one of my best friends plays osu! too now, and she does indeed notice my status, and even wanted to listen to the song, too. I find it useful as to share friends music/beatmaps without them being in osu! or maybe some would like to show off how awesome they are by playing mtmcl's I Want You on +Hidden..
When i'm looking for people to watch, it is quite inconvenient to not know what mods someone is playing with. There should be a way to find people playing songs without mods, so that you don't keep finding people with hidden or doubletime.