Big 12 women's basketball, after Kim Mulkey left Baylor for LSU after the 2020/2021 season, has been a solid conference, but with no blue blood school. Since Mulkey left, Baylor has finished the season ranked 7, unranked, 15. Baylor has won 3 NCAA championships and Texas Tech won in 1993 and the current Big 12 schools have a total of 5 Final Four appearances.
Right now, you would rank Big 12 women's basketball as the 4th best WBB conference, but adding UConn would push the conference to #2 or #3. If you believe WBB is rapidly gaining in popularity and potential monetization, UConn adds tremendous value to the Big 12.