Frankly should have made something new up than pick gnolls, who have been playable since basic. Something being in every edition as 'yup these can be people, just weird hyena ones' probably wasn't the best idea, especially after their 4E interpretation was so well received
Hence being watered down elves. You lose some of the more specific stuff and you get versitile from the human half, but its still recognisably half of it from the elf side, especially with the various half-elf variants
Like, they legit work as a "Switch out these options and add these" type of deal, that's how close they are to elves
Art sells folks on options. You can describe stuff in text all you want, but a picture of it gets it across better.
We can query how good said art is, of course, but a picture's worth a thousand words
(EDIT: if there's weird typos I got a new keyboard I'm getting used to it)