Music channels are this weird, broken mess; some channels are weirdly split into two under the hood and which one you get depends on where in the UI you click ( try it! https://www.youtube.com/watch?v=aajhC6GjK30 -- the icon and the artist name right next door under the video go to two different YouTube channels ). Playlists are sometimes replaced with Albums except it doesn't work right, and there's a bug where the infinite scroll repeats the first chunk of options forever when browsing albums. I assume the lack of sorting is just an oversight in the Music Artist template, because it's not like they tested anything else about it.
That happens a lot with music channels, which tend to aggregate videos uploaded across multiple channels but are labeled as coming from one channel. I’m not sure they opted to remove the option.
I understand the desire to control how users are exposed to your content, but I think these options err too much on the side of removing user freedom.