Good he utterly deserves it. He has proven that he could become a very serviceable shooter one day, he is a physical beast for his position, and he has shown a knack for making special plays when given the opportunity. For a rookie on the 1/2 seed in the east, he has done everything asked of him. This is even before you take into account his better than advertised defense.
He deserves to be on the 1st rooks team. I know, I know that it will be cluttered by scrubs who put up better numbers on dumpster fire of teams, but Jaylen has been very effective on a very good team. The only other rookie who has had a better impact on a good team is Brogdon, and he has a lot bigger role.
Kudos to Jaylen, don't rob him NBA. Embiid, Saric, Brogdon, Murray and Brown should be the starting 5 in my opinion.