So... did you just start watching college basketball when the BE split?
We're going to ignore UConn's ridiculous championship streak for a second, and off the top of my head we've got Marquette, Georgetown, and Butler that all went to final fours. Butler actually having gone to the NC twice during that time. I only choose the final four accomplishment since your previous post made it seem like that is your determinant of success.
You think FSU, that has 1 final four (1972), NCState (last one in 1983), Maryland (1 final four ever), Indiana (2002, previous to that 1992), accomplished more during that time based on your own final four criteria? Or, would you like to change your criteria now?
Programs go through ebbs and flows, Georgetown/Marquette are in a down cycle, but their programs are too big not to turn around (really really hoping now that Wojo is gone this is true for MU!). This is the exception that proves your power conference rule. Those two big programs have a down cycle and Nova was there to keep things at the highest level, plus other programs without as much historical success stepped up.
Providence had gone to the tournament every year since the BE split until COVID, Xavier has only missed the tournament 3 times in the last 20 years until COVID put an end to that (including an elite eight run that only ended when they ran into #1 seeded Gonzaga), Kevin Willard turned Seton Hall into an annual contender, UConn was brought back into the fold and I think will soon bring their 'A' game again, Butler that has been to the tournament almost every year since the split, and down the line.
So don't try to use NCState, IL, Indiana, etc as some bastions of success for other conferences yet hasn't done anything since the BE split, but tell me you can't count MU/GU and the rest. The only area this conference has struggled is in second weekend tournament games... and that's only going to last so long because these teams have been damn good year in and year out.