Isn't that the problem. The 5e attempted to use 50year old RPG lore for a modern game.But, half-elves don't have their own societies. They never have (not in core anyway).
Can't we have half-elf transform and become.... like the tiefling (a race that is often the offspring of a human and fiend)?
4e have tiefling countries and kingdoms. 5e reverted this.
Why don't we move forward? Make half elf and half orc like tiefling and give them their own cities states, countries, empires, societies, and cultures?
Imagine counties of people who are mostly human but can see in the dark and live to 200 reguarly. What kind of towns, heroes, villian, weapons, and spells would that create? A human who gets 100+ years in prime health or an elf with actual ambition.
Why is 5e chained to a past mentality and to past fans who frankly don't even play 5e?