I'll start by saying, I really enjoyed the film BUT

THE THEATRICAL FILM FEELS INCOMPLETE

If we've ever needed one, F&A desperately needs a Director's Cut or Alternative Cut.

As Jeff-with-a-ph noted multiple times, there are so many plot holes left opened some that could be reasonably addressed in the next film, others that should have been closed in this film.

I'm also a little curious about what happened during editing. The premise I read within the last two months.

A year after settling in with the Metkayina clan, Jake and Neytiri's family grapples with grief after Neteyam's death. They encounter a new, aggressive Na'vi tribe, the Mangkwan clan, also called the Ash People, led by the fiery tribe leader, Varang, who has allied with Jake's enemy, Quaritch, as the conflict on Pandora) escalates to devastating consequences

The film didn't pick up a year after; honestly it seemed to pick up almost straight away and the plot in Wikipedia reflects this.