The recommendation in your last post does not get me what I was hoping for.
I went into iTunes on my Windows laptop and edited the "album info" for my albums that had songs from multiple artists. I deleted the "various artist" value in the "Album Artist" label for these albums as you suggested. All the albums had the "Compilation" check box checked. I re-synced my iTunes library with my iPhone 7.
When I select the "songs" view in my iPhone 7 music library and sort it by "Artist" all the songs from albums that have no "album artist" value know appear at the end of my sorted list under the "?" heading. They used to appear under the "V" heading (Various Artist). The songs within the "?" heading aren't displayed in alphabetical order by artist either. They just appear grouped by the album they are in within my iTunes library. The only difference now is that they appear under the "?" heading rather than the "V" heading (for Various Artist).
So, it sure seems to me that the iPhone interface does not allow you to easily find all songs for an artist across all the albums in your library. It sure seems to me that the iTunes App and the iPhone Music App are using the value in the "Album Artist' label when they display songs by what they call "Artist".
In the iTunes Windows App you can get a list of all songs by an artist in your library (across all albums) by selecting the "Songs' view. You need to make sure you are displaying the "artist" label for each song (not the album artist label) and sorting the song list on the "artist" label. It's a little more cumbersome than just selecting the "Artist" view, but it works. On the iPhone you don't have this option as best as I can tell.
If what I'm finding is indeed correct it would be nice if Apple would change their labeling to "Album Artist" or correct their software to use the "Artist" label at the song level when displaying/sorting their songs by "Artist"