He absolutely has underachieved with Dallas in the playoffs. Wild to suggest otherwise. Only playoff win was to a team with a losing record.
2021 - Lost at home as the 3 seed to the 6 seed.
2022 - Beat the Bucs as the 5 seed. Bucs were 8-9 and won the NFC S. Beat by SF in round 2.
2023 - Lost as the 2 seed to the 7 seed.
I don’t understand how anyone would suggest that’s not disappointing..