The short answer is incompetence.
Scott Johnson at Powerline had a friend (Local Arizona Attorney Jack Clifford) watch the proceedings and guest blog about them:
Day 1:
https://www.powerlineblog.com/archives/2022/12/jack-clifford-lake-v-hobbs-day-1.php
Day 2:
https://www.powerlineblog.com/archives/2022/12/jack-clifford-lake-v-hobbs-day-2.php
The short answer is that Hobbs proved Maricopa County is incompetent, but did not prove it incompetent enough to change the results, and did not prove fraud.
Oh, I doubt that Hobbs thinks Maricopa County is incompetent.
She’s probably quite impressed with the way the Steal was carried out. All she had to do was sit on her butt and do what she was told by the DNC dirty tricks team.