Humans and KT, being of the same race, share similar or the same hairstyles/hair colors.
Void Elves and Blood Elves, being of the same race, can be concluded to share the same or similar hairstyles/hair colors and other customizations.
For instance some Void Elf beard options are going to Blood Elves, and we already have the skin tones down.
People have also suggested different tints if blonde, just like the datamined autumn or sand blonde for Night Elves isn’t the exact same shades of blonde as on Nightborne.
This level of pedantry you’re showing is really useless at this point.
Did people of other races who get extra customizations cease asking for more? No, they kept asking for different things after one matter was settled.
Take Worgen revamp, got a full revamp and then wanted female Worgen to have glowing eyes just like males.
Did Blood Elf players stop asking for more customization once they got Golden Eyes? Nope.
Did Night Elf players stop asking for more once they got Night Warrior eyes? Nope.
Ion even said that character customization is never ending and they always want to add more options so people can express their characters how they want.
Thus even Blizzard supports people continuing to ask for further character customization options.
To sum it up:
1) They’re the same race and shared similar/same styles are allowable
2) People have suggested different shades that give the same outcome (there’s over 20+ kinds of blonde hair color that exist, use some not used by Blood Elves)
3) None of the customizations coming in Shadowlands are a “final pass of options” for any race, Allied or otherwise. Ergo, people are supported in asking for further customization options.
I suggest you stop engaging in pedantry as it’s pretty clear Blizzard doesn’t support your notion.
Maybe if you spent more time organizing and supporting the requests you want instead of going to other requests and constantly spouting “No no no no no” like Michael Scott from the Office then you’d probably get some options you actually want.
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To help illustrate my point:
And since Blizzard gave Void Elves 4 shades of pretty much the same skin color originally and saw that as 'good enough to ship', I'm really sure they can afford giving different shades of 'blonde' to Void Elves as well.
Especially since Blood Elves have only 4 hair color options that can be considered any semblance of blonde but my picture is already showing 10 diff shades of blonde.