Happily ever after endings are for fairy tales.
It's all cheap. I don't like cheap endings. I don't care what your ending is, as long as your story supports said ending.
As a writer at least you're sure that your work will linger in someone's heart forever.
Anyone who's interested in the topic might like perusing the responses in that thread too. :)
I have written a story ending when the planet is thrown into its sun! Also in "Return" there is a interesting resolution for the heroine.
If I read a story about a main character that keeps getting beaten down, I don't want a tragic or bittersweet ending. I want the character to reach a point where they've overcome something, won, or just are finally happy. I'm just not a fan of stories that are a tragedy from beginning to end.
If it's a generally mixed story with lots of ups and down, I'm fine with any sort of ending as long as it makes sense and fits the story.
Most endings I’d argue are bittersweet to some degree (mostly in genres like action and adventure). It’s very hard to get a purely happy ending with no sad/depressing aspects at all to it (although that is not really the case with things like slice of life or comedy).
On one end of the bittersweet spectrum you get like Mortal Engines, Maze Runner or (for anime fans out there) the first season of 86, where everything is “for the best” and most characters get their desired outcome. Mostly sweet, but also some bitter aspects. On the other end you get things like Chaos;child, Your Lie in April, Anohana, things like that. Where, although the overall tone is happy, it’s still depressing as hell.
But happy or tragic endings can be done very well too. Your Name and Weathering With You both have arguably purely happy endings which don’t feel forced at all.