I’m sure we will have more customization added over the entire patch cycle. 9.0 just wasn’t time for allied races. The ones that did get something (mag’har and void elves) just copied things from their “parent” races.
Support my Customization Hopes thread! There’s some nightborne suggestions there, post yours as well!
https://us.forums.blizzard.com/en/wow/t/customization-hopes/690185