Honestly I suspect the Horde has retreated from any territory it took in BfA, probably hoping the Alliance will do the same.
Most of them seemed have left with her. Can you think of any?
How exactly? I mean Ashenvale hasn’t changed much as far as we know, and Darkshore was a bit of a wreck before we got there, plus I doubt the NEs want the Horde coming back. Also the Horde is broke and we already have to repair the territories the Alliance wrecked. Have you seen the state of Tirisfal lately?
Already happening. I mean there are literally neutral quests doing it in Shadowlands. What makes you think the Horde is fighting with Sylvanas still?
They haven’t which is why you have tension in the Alliance.
I am pretty sure nothing has suggested they are fine with Ashenvale remaining in horde hands and Tyrande gave up Azshara in MoP because A) the NEs barely had a presence there anyway and B) without Azshara, Orgrimmar would be starved of resources again which would almost certainly lead to war again when the Orcs had to choose between starving or expanding into areas with resources. Even more so when the NE start refusing to trade the moment anyone in the Horde offends them.
The horde doesn’t have the money to built the NEs a new city unless they want a really crap one.
The Alliance has no legitimate claim to either territory. The last member of the royal family of Lordaeron is hanging with the Horde at this point and wants Lordaeron for her forsaken and Quel’thalas belongs to the Blood Elves and unless your suggesting the Alliance should be subjugating nations against their will and setting up dictators, the Alliance has no business there. Particularly when the Alliance did nothing to help reclaim any of the land from the blight of the Scourge.
Your assuming the Horde has it to hand over. Gallywix has left the Horde and almost certainly taken his money with him knowing him.