It is.This isn't true for 4e D&D. It's not really true for AD&D. I can't comment on 3E or 5e.
The "half" races and the "full" races are not the same. Even when you take out the ASI, the half elf and elf were never the same. They were unique combinations of traits.
I never said half elf and half orc are more deserving than goblin..
Choco-vanilla and choco-mint may taste nice, but if you offer me 8 unique ice cream flavours and half of them are just mixes of the other four, I think I'm well in the right to call out that they're not actually unique.
Unique mechanics doesn't make a race, their flavour makes them the mix of their two parent species, and due to that they honestly don't deserve to be in the starter book alongside basic stuff like "Human" and "Halfling", where you're throwing the simple basic options to show how to play the game. Making complicated stuff like "Oh your parent were X and Y" should be for down the line and later products, you don't need to know how to make them on the basic starter book
Tabaxi and goblins deserve to be in the PHB well before half elves and half orcs because 'cat person' and 'goblin (affectionate)' are widespread, recognisable niches that are unique and stand out as options. Half orcs and half elves are just variants on the existing ones at their core.
I'm just saying contrary to popular belief they have unique mechanics and often to get unique lore. It's just that the community constantly likes to go back to problematic times out of Nostalgia or Money Grubbing which causes them to constantly have problematic lore rather than expanding the non-problematic lore.
How many times has D&D revered back to lore that we now consider problematic?
Instead of taking the kernels of uniqueness in some of these species, we always revert back to the problem times.