Recommended Albums from album page

Continuing the discussion from Recommendations based on DSOTM:

I would like to hear from Roon on this. What drives this? I am seeing 3 or 4 recommended albums for extremely popular albums. This is very strange behaviour. For e.g. for the album Crosby, Stills and Nash I only get 3 album recommendations. Same for Rumours. Is this all that Valence thinks can be recommended?