The thing that I bet would annoy him is that everyone always stresses how he is the 2nd best player on his team, and almost no one in the media says the same thing about DM.
I also think people don't realize that he projects to be better than Embiid.
Embiid is the best player on that team by a significant amount and still projects higher. The only reason to be concerned about Embiids future is injuries and that is the only way Simmons becomes a better player is if his career is derailed by injuries even more than it has.