I agree with everything you said.
I have also always wanted a reunification of the Elves because of Aurora Skycaller and Fiora Longears, who I had the pleasure of encountering on my main here back in Classic.
Aurora Skycaller was once outside of Quel’Lithien Lodge and longed for the unification of the Elven races - most likely specifically the Night Elves and the High Elves - and a High Elf named Fiora Longears who tried to make connections between Theramore and the Night Elves of Auberdine. With the acceptance of the Highborne Night Elf mages to Darnassus and Night Elf society as a whole; the outreaching to and embracing of both the Draenei and the Gilnaeans by the Night Elves; the High Elves’ strong ties to the Alliance through Theramore, Quel’Danil Lodge, Farstrider Lodge, Allerian Stronghold, and The Silver Covenant; and to a lesser extent the High Elves connecting with the Night Elves such as High Elves and Night Elves working together during the Battle for Mount Hyjal against Archimonde, as well as working and living together at Allerian Stronghold and with The Silver Covenant in Northrend and Pandaria, and Vereesa Windrunner attending Malfurion Stormrage and Tyrande’s wedding: the seeds are all there to bring the Elven races steps closer to being one again. One such High Elf seemingly has already taken the invitation, as the High Elf Huntress Davinia served under the Darnassus banner in the campaign against the Horde in Stonetalon.
Add that with your points about the Blood Elves and the Nightborne, and I think it would be amazing if we could actually have an Elven army done right, instead of rather pointlessly wasted in a timelock spell like they ended up being in Suramar.