This is a great question--I was just wondering this while watching the games yesterday. I came to the conclusion that it is difficult to truly answer the question because of the way the game is currently being officiated.
The refs are allowing players to play defense--both on the ball and off of it--with their hands rather than their feet. This promotes the "fouling" style of physical defense--clutching (especially with two hands on an offensive player) and chunking--that has become the defensive norm.
Additionally, the refs call far too many charges in today's game. Most of the charges called are not textbook charges--the defensive players are allowed to slide into position after the offensive player commits to his move. Go back and watch games from 15-20 years ago--defenders were not regularly rewarded for sliding into position late.
Ultimately, it is less about the coaches and players utilizing "cheating" defenses and more about the refs allowing the physicality to restrict offensive movement. When a team like Louisville is allowed to use this to its advantage (for example, Pitino coaching his players to foul every time knowing that the referees will choose not to call every foul), it further exposes the lack of proper officiating the game is currently experiencing.
However, for the purposes of full disclosure, if I was coaching DI basketball right now, I would be teaching an aggressive, physical defensive strategy, instructing my players to foul every time (a la Pitino) in order to disrupt the opponent--if the refs are going to allow a team to get away with it 60%-plus of the time, it's foolish not to take advantage of that. Put the onus on the officials to enforce the rules correctly.
