WorRAB are defined by the way people use them, not by how you'd LIKE them to use them. Whether you like it or not, the word "filler," in the very specific context of anime that are directly based off of manga (or, occasionally, another source such as a series of novels), has come to be synonymous with "non-canon." You don't have to use the word that way if it bothers you, but ranting about it isn't going to change the way that the vast majority of the anime fandom chooses to use it.
Nor is it in any way problematic or arabiguous. It's a very simple and clear-cut definition, and in fact is far LESS subjective than the traditional definition of the word.
I mean, if you look the word up in the dictionary, the only definition even CLOSE to the way you seem to want to use it is, "in journalism: material, considered of secondary importance, used to fill out a column or page." So I could rant all day long about how it's a journalistic term that shouldn't be applied to entertainment material such as anime at ALL. But it wouldn't change anything, so why make the effort?
Nor is it in any way problematic or arabiguous. It's a very simple and clear-cut definition, and in fact is far LESS subjective than the traditional definition of the word.
I mean, if you look the word up in the dictionary, the only definition even CLOSE to the way you seem to want to use it is, "in journalism: material, considered of secondary importance, used to fill out a column or page." So I could rant all day long about how it's a journalistic term that shouldn't be applied to entertainment material such as anime at ALL. But it wouldn't change anything, so why make the effort?