IMO, the most important UX features for anchor links is that you should be able to send them to other people (and save them via bookmarks).
Say that you find yourself needing to check the "Control code table" section of the Wikipedia ASCII article from time to time (for some reason). Being able to bookmark that specific section[1] is much more convenient than having to always start from the top of the page[2] and then scroll down (or click some on some anchor link) to get where you actually want to go.
This thirty-five website doesn't seem to offer that functionality because it doesn't use #anchor-name URLs.