Actually not hard to see why some OSRS loves RS3, as perhaps they actually "hate" RS3 but they hate OSRS even more than RS3... because of...
"the absence of updates for high-level players, the disappointment surrounding the Forestry system, the anticipation for Desert Treasure 2, the removal of the ancient Prayerbook, the disparity in update history compared to RS3, the need for quality of life improvements, the subpar quality assurance practices, the abandoned Tombs of Amascut, and testimonials from players across all skill levels who are dissatisfied with the current state of the game."
Are you a skiller in OSRS, especially not an IM? It is not hard to see even skilling content may be good to you in OSRS, but skillers actually have bigger and bigger influentials in the RS3 economy, with more and more and more skilling content.