You'd think, but so many starting centers these days have little willingness or ability to defend the perimeter. That includes guys like Embiid and Gobert who're widely considered among the best defensive players in the league, as well as guys like Vucevic, Gasol, Cousins, Jokic, Poeltl, Zubac, Baynes, Kanter, and Lopez who're all starting for playoff teams. Could probably add Adams and Drummond to that list too.
There aren't many centers in the league who can defend the perimeter and protect the rim, and given the choice most good teams will sacrifice perimeter defense to put a rim protector on the court.