If we're talking about appeal, then that's a whole different story.
No offense to those who like the look, but a buzzcut is generally chosen for its practicality than for its aesthetics. We see plenty of Elves with short hair in this series, there's a certain look they seem to go for that I'd agree with them being both practical and establishes the Elf aesthetic. Arondir happens to be the only one with a tight buzzcut.
If we're talking about Elves caring about aesthetics and having magical scissors and barbers with 2000 years of experience, then I don't see a reason why Arondir would settle with a buzzcut with a fade. It still wouldn't make sense to me. I can see from a 'directors' point of view that maybe they wanted him to stand out from the rest with a completely different aesthetic and look, but it's for this reason that it's also odd that it differs so dramatically from the Elf aesthetic they're setting with the rest of the short haired looks.