>>2540803Fact is any canon pairing is forced to be slow to fit into the pace of the story while other relationships aren't as tied down by plot, they're free to have more natural chemistry.
It's not like it wasn't the case with Hinata/Sakura, Rukia/Orihime, Frog/Gravity (though the author did his damndest to kill that one off), Rei/Asuka/Mari, every harem anim will have people with nothing better to do continue to complain about canon ends for years.
Canon pairings as the most popular are rare and only really happen when there's only that allowed.