No, what i meant was all that pathological yearning for substanceless "good endings" (sic), that GL community has. There's overwhelming amount of crappy, forgettable shoujo ai works, both in short and long formats, that are just about that, so i don't get why when something different comes along, there's always bitching about it not being #yourusualstuff. *
...and complaining about time travel or reasons for it is just nitpicking, because it is nothing more than a plot device. It's as fruitless as discussing drugs from Relife or zombies from Walking Dead. This manga isn't a sci-fi, nor it is a romance** - it may use those genre's elements, but the story's mainly about personal growth, working toward earning your happiness, and changing yourself for the better.
*even "Purple Qualia" have been criticized for lack of outward declaration of love by some
**obviously personal opinion, but i think i'm right, so you know, fight me