Dunno, it's hard to conceptualize to some extent I think. If you're older you've been ingrained to view defense as blocking shots, keeping guys to the outside, clearing the front of the net, gaps, locking things down...but there wasn't much emphasis on being able to move the puck or do with it for those "shutdown" guys.
With the way the league has gone, even if you're good at all those things but not at moving the puck out you'll get murdered because no matter how good you are at defending you can't do it the entire time you're on the ice and not eventually get scored on.
These days defense and being a shutdown defenseman is more about getting the puck back and moving it up the ice quickly. however you make that happen, the important part is that you get it back and then your team goes on offense and you spend as little time in the defensive zone as possible. So all the old school defensive stuff needs to be geared towards recovering that puck for your team, not just preventing the other team from scoring.