While only 1 game into the 2021 season, this goes more toward the offensive approach since 2016 and the win-loss outcome.
When you look at Zeke's rushing attempts vs. Dak's passing attempts, you will see a pattern emerge:
2016: Dallas was 13-3 (Zeke had 322 rushes vs. Dak's 459 attempts)
2017: Dallas went 9-7 (Zeke had 242 rushes vs. Dak's 490 attempts) (Zeke suspended 6 games that year)
2018: Dallas went 10-6 (Zeke had 304 rushes vs. Dak's 526 attempts)
2019: Dallas went 8-8 (Zeke had 301 rushes vs. Dak's 596 attempts)
2020: Dallas went 6-10 (Zeke had 244 rushes vs. Dak's 222 attempts) (Dak missed 11 games due to injury)
2021: Dallas is 0-1 (Zeke had 11 rushes vs. Dak's 58 attempts)
The point is when the offense was focused on Zeke running the ball Dallas had more team success whereas when the offense focused on the passing game, the team success wasn't there. While some will point to the defense as the issue, the defense played well enough from 2016-2019 with 2020 being the outlier.