Not only are they not doing that, if you do the epilogue quest in Bel’ameth, Tyrande lists the places night elves currently call home, and she even mentions returning to Teldrassil at some future point.
You can stop worrying, canonically they are not abandoning Kalimdor at all.
Tyrande is a wise leader. She saw that only Bel’ameth is nice and all but the rest of Amirdrassil is forever locked to daylight so she decided to rebuild Teldrassil asap.
At least in Kalimdor they can go outside and enjoy a nice night.
So yeah… we are not abandoning Kalimdor.
Its also the OG Alliance capital. AND its shaped like a circle with clearly defined wings. Stormwind will always be an inferior city due to simple geometry alone.
I dont know if you remember the MoP era, but Kosak’s name was thrown around a bit to explain certain lore changes and character assassinations.
The game really suffers when the developers play favorites.
They abandoned Kalimdor and making a capital on the Dragon Isles proves it. The night elves are leaving their ancestral lands for good. That’s VERY bad writing.