Having the track artist in the filename is not necessary if the folder structure is music\ArtistName\AlbumName\01 - track.mp3.
This article explains the current recommended folder/filename structure for single-and multi-disc albums:
https://support.plex.tv/articles/200265296-adding-music-media-from-folders/
If you are relying on Plex to match your albums and retrieve metadata from online sources, the folder/filename structure is very important. If you have configured your Music library to “Prefer local metadata,” and your embedded tags are very accurate, the folder/filename structure is not as important, although it is still strongly recommended.
Adding the year is good for movies and TV, but I don’t think it does much, and may be problematic, for music libraries. I’ve never done it.
