I think that we've lost appreciation for endings, as culture. It's all "content" designed to go on forever.

I actually hadnt considered this point. It is certainly one of the things I enjoy more. And I also enjoy that the overwhelming majority of Manga/Anime has endings where the good guys win and the bad guys are defeated. It's so uncommon in this day and age that it makes it actually worthwhile again, instead of just childish things. Its the same reason why I am getting turned off from Anti-Heroes a la "The Boys" (if its a Punisher "I am doing this because the system is broken" sort of Anti-Hero, I am still fine with it though).