MrHoffman has provided the correct answer on speculation of Apple intentions in future features.
With that said, when I choose "Suggest Less" on an Artist, for the most part they are never played again. The one exception I have found is when there is a collaboration with an Artist that I have liked. For Example, Brittany Spears is one of my Suggest Less Artists, yet Elton John is one of the Artists I like so I did hear that "Hold Me Closer" song that was a collab with those 2 artists, but after choosing "Suggest Less" on that song, I have not heard it again. Besides that, there has never been a Brittney Spears song played in my 6 years of my daily use with Apple Music suggesting songs on my way to and from work.