Once upon a time, AD&D had grey, high, wood, sea and valley elves, along with the "oh, these are mythical, they don't exist, ho ho, why are we even mentioning them in the Monster Manual" drow. I don't think anyone's missed the grey or or valley elves in a very long time. I don't know that we shouldn't just toss "wood" and "high" elves as more different than humans who live in the country or city into the dustbin of history.
That said, if astral elves are a distinct people with their own write-up, it seems silly to suggest drow and shadar-kai are not. I would be fine with having "elves," "drow" and "shadar-kai" as three distinct peoples with their own write-ups in the 2024 PHB.