You're right we disagree. JB has always had to coach/recruit against legends. John Thompson, Jim Calhoun, Carneseca, Massimino, Pitino. Three of those guys were legends when K still had a reputation for not being able to win the big one. Two of the Three had won NCs before K win his first. In '85 3 teams made the final 4. There were 2 in the FF in '87. Even after the league grew in the mid-late 90's it was a consistently tougher league than the ACC has been. In '96 the league had a 1, 2, 3, and 4 seed in the tournament. In 2009, they had three 1 seeds and 7 teams in the tournament. In 2011, 11 of 16 members made the tournament and UConn won the NC. That's a lot of greatness spread across SU's whole time in the league.
In 2014, our first season in the ACC only 4 teams were ranked in the top 25 at the end of the season prior to the NCAA tournament and only two in the top 10. 6 out 15 teams made the NCAA tournament. In 2015, again 4 finished in the top 25 and 6 made the tournament. In 2016, 5 finished the season ranked and 7 made the tournament. In 2017, 6 teams finished ranked and 9 teams made the tournament. In 2018, 5 teams finished ranked and 9 again made the tournament. And in 2019, 5 teams finished ranked and 7 made the tournament. 3 teams got number 1 seeds. The last few years have been the deepest and the mosk akin to what we had in the Big East.
The ACC has been good since SU joined. It hasn't been better/deeper than the Big East was.