I don't know why people somehow assumed allied races were going to be subraces and nothing else. They've said outright that allied races are technically not subraces as far back as this interview from January 30th 2018 and even hinted at Vulpera being a potential allied race.
Quote from Afrasiabi: "The nice thing with allied races, especially because they’re not technically sub-races, is we can kind of do anything. Sky’s the limit.".
Heck, there's another interview that asked Blizzard which other allied races they'd considered that didn't make the cut, and their answer was "Pretty much anything with two legs we discussed being an Allied Race".
You guys need to get over this idea that allied races were ever supposed to be restricted to subraces.