This is something that has been kind of bothering me for years since GW2 released.
It first bothered me that the Gods - especially Kormir - would completely abandon Tyria. Not just from a lore perspective but even personally, as a player who invested themselves in GW1's lore and killed Abaddon alongside them. While Kormir was human she made sacrifices and pushed on until she had done all she could possibly do. It doesn't make any sense that 6 of the most powerful things in the universe cannot come up with a plan to at the very least, protect Tyria from the dragons, not necessarily kill them, which would cause cataclysmic destruction to Tyria...
Except you and your raid party are just killing dragons left and right anyway, and the asura can just come up with machines that "manipulate dragon energy". If the mortals can do this then what excuse is there that the gods can't at least help them? I understand ANet retconned Balthazar into a power-hungry maniac, but the gods returning to Tyria to help at least the humans would not necessarily mean world-shattering battles taking place. At the very least Kormir could come.
Speaking of Balthazar, wow, RIP.