There are a lot of manga which deserve an anime adaptation, but never really get one.
It seems that a lot of fujoshi banded together and voted overwhelmingly for the manga, as it seems that they really want to see an anime adaptation of it.
And in some cases, some of these manga get their anime adaptations decades after their runs ended, much like Parasyte.
This is evident as BL manga, 10 Dance, gets first place in the official AnimeJapan 2018 poll.