Lauryn Hill has released one studio solo album, it came out 20 years ago and is regarded as a masterpiece. The BBC link examines the album. The point is made that if you make one great album, there isn’t too much need to make any others.
Since 1998 Neil Young (taking as an example) has released 16 studio albums, 3 live albums, at least 4 box sets and 8 live archive releases. Of the 16 studio releases there have been a few good to great efforts and many not up to that standard. Of course Neil made classic albums in the 60s, 70s and 90s, but which approach is best? A perfectly created masterpiece and nothing else, or releasing albums whether or not the inspiration is there?