The ACC does play its conference tourney before the last

Week of the regular season. The ACC tourney is on the penultimate weekend of the regular season, and ACC teams play an OOC game against an opponent from the Patriot League (the only other conference which plays its conference tourney prior to the last week of the season) in the final week.

I see where you're going with the plethora of conference tourneys, but that's a consequence of the growth of the sport at the Division I level. I think it would be very difficult, if not impossible, to separate the two.