Comeon,I used the spoiler tag for a reason,do me a favor and do the same.
Yes the ending was rather ill-received,though the LN already somewhat deviates from the WN so that might end up changed(and considering some of the sexual and gory content I would assume both the manga and anime,should they ever reach that point,will deviate even more).
How to handle the here established Harem is the big question yeah.
As stated,not a fan of a split solution but that doesnt exactly leave many endgames in a timetravel story with a necessary set line of events(which wasnt a problem till Mity commited to the whole Aang rising Tenzin thing).
The story outright states that its Tenchi´s destiny to end up with a harem,though I will agree that the story itself still completely falls into the same trap as every other harem show of not actually acknowledging the situation during its runtime.
Dont even know what that abbreviation stands for.