That is one of the biggest mischaracterizations of a book/someone's position on this site that I've seen in a while. Literally, no one/no part of TCoE is advocating for "only superficial appearance differences between races". If you see the whole identity of the race tied to whether or not they have a +2 to Strength . . . you're just as bad as the optimizers that the Anti-Floating ASI crowd complains so much about.
I know you hate the race changes in Monsters in the Multiverse, but if your image of them is "the only difference between races now is nonmechanical physical appearances," then you've got your head on backward. Seriously, just go look at any single updated race from Monsters of the Multiverse or Fizban's, and you will find huge mechanical differences between them that aren't just "superficial appearance differences." There is literally nothing about the new style of design for the game that would suggest that PCs only have superficial similarities with the average member of their race. Duergar still have psionic Invisibility and Enlarging abilities, just like the average member of their race. Elves learn proficiencies from trances that show them visions of past lives. Dragonborn have damage resistances, breath weapons, and specific features tied to the type of Dragon that they're the most closely related to. I could go on and on.
No one has argued that the only similarity between a PC version of the race and a monster version of the race should only be physical appearance. No book has changed the race rules to promote that theoretical playstyle. The fact that you seem to believe that's what some people want and are using it as a basis to support your own opinion is concerning.