Just finished ACOWAR and I need to talk about it (spoilers)

Spoilers! Totally loving this series and loved so much about this book but there were parts at the end I had questions about - it felt a bit rushed and not necessary when Rhysand died (I was already a blubbering mess from all the other happenings), couldn’t all of the high lords worked together to mend the cauldron? Also Rhys is just like casually - nah I don’t have your powers all good just back to my normal awesome powerful self… And Amren coming back? I just felt it needed that brutal ending with one of the main characters dying, and dying saving everyone’s asses is pretty good way to go, but it ended a bit happy ever after… and then at the very end feyre was flying around in her lingerie and I would have thought for sure they’d head to the bedroom… (also flying in lingerie doesn’t seem like something Feyre would do?). IDK maybe just me and reading it too fast late at night!