I agree with the point that other people made about happy endings being realistic too. Like, just because something hurts doesn't mean it's inherently worth more, and the sooner that kind of thinking dies in the art sphere, the better.
HOWEVER, due to recent experience...I can understand where the correlation is coming from, kinda. ^^;
In the last few years, I tried out two new 'magical girl' anime. Both had marvelous animation, great character interactions, and amazing music. Both seemed to be building up their plots to emotional, heroic conclusions, where against all odds the heroes would have to try to save themselves.
And both COMPLETELY dropped the ball in the finale episodes, just to secure a happy ending. I'm talking "actually, the Big Threatening Consequence we've been stressing about all season doesn't matter; if you just stare into your lesbian girlfriend's eyes hard enough you can make it go away."
They just took all the significance of the hardships that came before and threw it right out the window. T_T
And it just left me so bitter...like, is this the state of storytelling now? A happy ending means literally cutting threats out of the story at the last second, with no explanation or acknowledgment of that fact??
It's just blatant disrespect for the viewers and the emotional investment they've had up to that point, and the worst part is barely anyone cares because 'at least my waifu didn't die~'. I'd rather see a thousand sad, heartbreaking endings that actually make sense than to go through that again.