@MonsieurQuack Only because the MC is the same wimpy dogshit loser we've seen ever since TLR popularised the cringy "spinless lucky pervert that faints at the mere sight of boobs and never takes advantage of all the adoring women throwing themselves at him" type of MC years ago.
Who would actually go to a stupid ecchi romcom manga filled with 80% of comedic sexy antics and fanservice for "the relationships that we cultivate over the years" when it's nothing but stupid fapfuel peppered with occasional attempts at seriousness? Who the hell would want a non-harem ending in a comedic manga that has shit like "cursed naked twister" as a chapter?
The series was repetitive filler with a generic protagonist and generic female lead with no romantic build-up or even meaningful character development for the MC (seriously we don't even get any internal monologues from him to understand his thoughts!), trying to act like anything other than the art was good is laughable.
You could skip every chapter that focuses on the other girls instead of Yuuna and then read the ending without missing anything so no this end and end pairing was shit writing and the way the other characters were treated by the author is disgusting given that nothing in this chapter would have occurred without the aid of the other girls. They are literally the only reason the MC is alive and Yuuna is still here, Yuuna did jack shit to work for her "happy ending" and the MC was just totally passive without the other girls shoving him at Yuuna.