In the Spotify library under the Artists subheading, only Artists which a user follows are shown.
Previous streaming services I have used populate this field with ALL Artists whenever a song is liked which makes it much easier to navigate your library without having to follow an Artists.
There needs to be two subheadings;
Artists - Which will populate all Artists from all liked songs.
Followed Artists - Populates all followed Artists.
Also, under the album sub heading in your library it only shows full albums which have been liked. Again, previous streaming services detail all albums from all liked songs, even if the entire album has not been liked (just a selection of songs from that album).
The above really helps with navigating your library. At the moment the functionality is very limited with the only workaround being that you can sort the liked songs playlist by Artist name but this doesn't help narrow down specifics.