Best albums of the decade were all made by superstars, how come?

The aggregation site Album of the Year compiled End of Decade lists by two dozen magazines. Turns out the majority of artists on the list were already superstars when they made their decade-defining albums - The Outline notices, and tries to explain in an interesting article. Also, they analyze what music critics are today. Below - AOFT End of the Decade list:

1. Kendrick Lamar - 'To Pimp a Butterfly'
2. Beyoncé - 'Lemonade'
3. Kanye West - 'My Beautiful Dark Twisted Fantasy'
4. Robyn - 'Body Talk'
5. Solange - 'A Seat at the Table'
6. Kendrick Lamar - 'good kid, m.A.A.d. City'
7. Frank Ocean - 'Channel Orange'
8. Frank Ocean - 'Blonde'
9. Rihanna - 'ANTI'
10. Arcade Fire - 'The Suburbs'
11. Lorde - 'Melodrama'
12. Vampire Weekend - 'Modern Vampires of the City'
13. David Bowie - 'Blackstar'
14. Kanye West - 'Yeezus'
15. Sufjan Stevens - 'Carrie & Lowell'
16. Kacey Musgraves - 'Golden Hour'
17. SZA - 'Ctrl'
18. Beyoncé - 'Beyoncé'
19. Beach House - 'Teen Dream'
20. Carly Rae Jepsen - 'E•MO•TION'