Hetalia Fanfiction blogs and Letter Fics

I love reading Hetalia fanfiction on Fanfiction.net. A lot of the stories I read have well developed plot lines. Recently Fanfiction has been trying to delete all of the blogs and letter fanfics because of the stupid no interactive stories rule. Fanfiction has a motto called "Use your imagination." If they have so many rules on what you can't do why have that motto at all? Interactive stories are considered part of the writer's imagination to right?