It always surprised me that so many folks here think that Kessler did not get enough minutes. He finished the season with 23.3 and the only reason why he did not reach 24-25 minutes was because he left his last game early with injury and did not play in the last games of the season when young players were given heavy minutes.
Lets compare him with other good but not great centers in the league: Valanciunus - 23 min, Gafford - 24 min, Hartenstein - 25 min, Capela - 26 min, Poeltl - 26 min, Zubac - 26 min. Kessler is right there with them in terms of both the impact and minutes. To get 30 minutes or more as a center you should be among the very best in the league: only 8 players played that much this season. Kessler is getting exactly the minutes he deserves.
People complained that Keyonte is the golden boy and getting way more playing time than he should - and he got only 27mpg, 3 more minutes than Kessler.