I don't mind the anime filler, the writing team is doing a good job at using the filler to give much needed development to the characters that dont get time in the manga, which is the vast majority. If it were up to the manga, I wouldnt know shit about Metal Lee or ChoCho, or even Mitsuki to an extent. The relationship between naruto and orochimaru has been explored and we have even gotten old man tsuchikage! As long as it is good filler that develops the story where the manga is lacking then I am all for it. Manga is canon but it also has the power to retroactively canonize parts of the anime, same goes for authors statements.