Yeah, fantastic analysis. Whatever problems this show still faces, whatever technical issues you could say about this seasons overall writing (and that leading up to the finale), they still nailed this ending/season overall within the limitations and what can be expected from this show. Of course there is always more they could have done. Characters and plot arcs could always be more fleshed out and given more depth (but can't do to the format of the series and lack of time). But all that aside I think the finale was both amazing in its pure entertainment, as well as just being a great end to this seasons arc. And I do think each episode this season had a tighter more coherent structure compared to Book 1 and especially Book 2. I also think the overall seasons structure was competent and had a follow through (and the ending actually paid things off and didn't feel detached).
My only criticism is that I do wonder if they could have done more with the Red Lotus. Instead of having the air nation training one off episode, maybe we could have had an episode that showed us the complex nature of Zaheer. The depths of his fierce commitment to his philosophies (why he came to this world view), as well as the relationships of that organization (why they follow Zaheer). The P'Li war lord exposition was poorly handled but it was very interesting. I would have liked to know more about that. I still love Zaheer as a villain. But I can't help but wonder how much more he could have been. He never descended into a cartoony mustache twirling villain, but he also seemed very surface level when all was said and done.
I loved every episode this season though. On an entertainment level I can't complain.
Ehh, I think that episode was needed. The plot-lines it handled COULD have been truncated though.
Ultimately, I think I am satisfied with the Red Lotus. They could have been done much better, but most of the issues with them stem more from the short season with the shorter episodes.
Now, I would not say no if next season had some flashbacks with them, but I think that is unlikely. If the next season is the same length as the last, I think I would much rather flashbacks from the Gaang.