Tasha's Cauldron of Everything added race rules that removed the previous stat bonuses and proficiencies that were baked into the playable races in the Player's Handbook.
The playable race rules in D&D have undergone a number of changes over the years.
There are some races from the annals of D&D history that need to remain out of fifth edition, even if a mid-life update is in the works. The 5.5 edition of D&D (as it's referred to colloquially) is coming in 2024 and it will likely also add new content, as a means of enticing the existing fans who own all of the books. A new version of Dungeons & Dragonsis on the way, and it has the chance to change the existing rules of the game, in order to make them run more smoothly.