Void Elves and Blood Elves are different, and these differences should be celebrated with fun things to play with. I’m just already very ready for all the weirdos who are inevitably going to try to stir the pot over this - though I expect many of them are trolls. See a post a few paces above.
I feel like man’ari were inevitable just from how the war for Argus was won. It’s a safe assumption to point at the end of Legion, and the unlocking of the warlock class, for how we got to getting man’ari skins. Blood Elves haven’t done anything with Fel for a long time, and their story has been leaning more heavily into purification, healing, and restoration.
If I was putting money down on speculation, there is going to be a quest where the sin’dorei begin actively cleaning up the rest of the Scourge in ernest. This has already been an ongoing effort, but players have never seen or taken part in it. The cosmetic rewards being some kind of light (Sunwell) themed doodads or tats.
There just isn’t enough going on right now to make me think there will be Fel or San’layn customization, as others have hoped for.
As for who has the least, honestly was speaking on how void elves have the least void options. We haven’t got a single update with void since the race went live. Forsaken actually have a pitiful amount of customization, the lowest out of all main races and even outpaced by some allied races.