There aren't enough game designers who are capable of writing or competent at identifying good prose to make it a reasonable goal to cram prose down everyone's throats.
I usually get the feeling 1e was written as a somewhat stream of consciousness thing on Gygax's part. He just started writing about strength, and wrote a bunch of stuff he thought was interesting/important about strength and didn't bother to parse it out in any way.
There aren't enough game designers who are capable of writing or competent at identifying good prose to make it a reasonable goal to cram prose down everyone's throats.
Then hire a freaking editor. That's what editors are for. If the editors they've got aren't good enough, hire better editors.
Good example. And another one where I don't think the 1E version is any more flavorful, or an example of high-quality prose. It's just a lot messier and harder to read, with mechanics more appropriately placed in other sections of the book.
Having seen that, and the Half-elf section, I'm curious: what are some good examples from 1E? What is it, specifically, that 5E should aspire towards? I've never read 1E AD&D.
No, but my point is that perhaps a PHB isn't the best kind of book to use as an example.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.