Tiamat
[11] Champion
The definition of something is rare opinionated. Fanservice isn't one of those things. Fanservice is anything thrown in for the fans, ANYTHING. This isn't meant only for sexual things, it's literally anything. Any and all fanservice can be directly embued with the story, the reason it was created or why it's bad, it doesn't matter. So it is what it is, you can try and justify some things over others but it ins't because it ISN'T fanservice.
That's just your opinion. When enough people are using a word differently than the original meaning long enough they add a new meaning to the word. Anime fans have given it a new meaning. It is like how "gay" did not originally refer to homosexuals. Old meanings remain but get overshadowed.