The Shadow
Hero
The difference, though, is that the choice was made in-character. I'm not clear at what age, but my impression is that they were teenagers at minimum. Yeah, it was kind of weird! I suspect Tolkien considered it necessary because of the very different afterlives of elves and men.Tolkien handled half-elf lineage exactly how WotC is proposing: you pick one parent and have all of their species traits. Elros chose the human traits, and Elrond the elven ones.
Aragorn isn't even remotely half-elven - he's many generations removed from Elros. He's human, what makes him distinctive is that he's Dunédain. His kids with Arwen would be effectively half-elven genetically, I suppose, but I doubt they'd get to choose since Arwen herself chose the Doom of Men.