From NBC Sports w/ NBC Sports' comments:
NBC Sports' Peter King reports many in the Eagles organization believed Carson Wentz "couldn't handle hard coaching" and was coddled in his final years in Philadelphia. King said Wentz's persistent clashing with former offensive coordinator Mike Groh, followed by the team firing Groh, created widespread perception that the quarterback was unable to take constructive criticism. Wentz's relationship with Philadelphia coaches -- including former head coach Doug Pederson -- steadily eroded after Frank Reich left for Indianapolis and ex-QBs coach John DeFilippo parted ways with the Eagles, according to King. Wentz reportedly didn't connect with many teammates in Philadelphia and could be "stubborn" with offensive coaches devising game plans. The team drafting Jalen Hurts in the 2020 NFL Draft "completely blindsided" Wentz, per King, further damaging his relationship with coaches team officials. It would seem Reich, Wentz's new head coach in Indianapolis, has more to handle than just improving Wentz's mechanics and decision making.
SOURCE: ProFootballTalk.com