Whiteside might not be the best in any particular aspect but he's pretty much among the most well-rounded centers in the league.
His surprisingly soft touch, finishing ability, length, and sheer strength make him better offensively than guys like Gobert or Drummond to the point where he can go head to head with any center in the game in isolation.
He's on an entirely different planet on defense compared to KAT, Boogie, and Jokic. Whiteside is a legitimate elite overall defensive presence when mixing in his defensive rebounding, elite shot blocking instincts, length, and athleticism.
He's an elite rebounder too.
And yeah, he's 28 but Whiteside is NBA young and he's constantly improving his overall game plus he doesn't have a lot of NBA wear and tear. Just this preseason, Whiteside been showing off consistent effortless mid-game jumper that's been punishing any big with his hands down and anyone who saw him last season will tell you his mental growth was huge.
We saw Whiteside matching Embiid, blow for blow, for multiple seasons and Embiid is probably the most talented center in the game.
Whiteside don't get the respect he deserve for how impactful he can be.