Had Sozin approached Roku and said "I want to spread the wealth to the other nations, what is the best way?" I'm sure that Roku would have put Sozin in touch with the right people to start trade with. The reason that Roku hated Sozin's idea of "spreading the wealth" isn't because Sozin's idea was bad but was because Sozin's idea was really "Through my ruling the four nations I'll spread the wealth". Once the fighting starts to affect either the Avatar or spillover into other nations the Avatar steps in and ends the conflict. The reason that the Avatars don't step in to solve the infighting of the nations is that the infighting is pretty rare and usually doesn't last long. The world would be in a constant state of war with no peace in sight.
Now imagine if the four nations were constantly fighting amongst each other. The Earth Kingdom hasn't even completely fallen yet and has enough troops left over to launch a counterstrike at the Fire Nation itself. The Fire Nation has been fighting the other nations for 100 years and has only managed to defeat the one that had no defenses. The Avatar preserves peace between the nations in order to prevent wars like the current one. There is no sign the avatar would stop that. With time and immigration, all four nations could use the four elements together and become not only industrialized, but rise far above where they started. Through the co-operation of benders of all four kinds, a new island could be created where people of all four elements live and work together to make a better life. My own personal view is that it would be possible to mix the nations in order to create a world that could be both industrialized yet accept the independence of each nation. The avatar does also step in in conflicts where earth kings are conquering other earth kingdoms - that was what the whole Kioshi deal was all about. It isn't Industrialization that is the bad guy here - instead, it's wanton disregard for the sovereignty of other nations. He was angry that there were fire nation colonies in the Earth kingdom. Roku was not angry about the industrialization of the fire nation. Firelords share their respawn spots with the Lava Annihilators.Simply put, yes the avatar is enforcing a state of living, after a fashion. Reputation: 20 reputation with the Hydraxian Waterlords. If the lava spawn is kept close to the Firelord mages can cast and help bring down both mobs quickly. If it is not killed quickly it will split into two. When he summons a Lava Spawn all melee DPS should focus on killing it. Tank as normal, when he casts Soul Burn it should be dispelled as soon as possible.
It should be dispelled as soon as possible.