They need to identify the disconnect between regular season success and the lack there of in the postseason because they are in unprecedented territory.
They continually build slow teams.
I remember watching those 2002-2004 teams in the playoffs. Back then I wouldn't see many (if any) regular season games for Boston but would see plenty of other teams on HNIC. And come playoff time, I'd finally get to see my Bruins and I was always struck by how much slower the Bruins were when compared to other teams I watched. They'd get into the playoffs, and their opponent (Montreal x2, New Jersey) would always seem to skate much better than the Bruins would.
Even in those early Julien years, the narrative was his teams had a hard time with faster teams. See Carolina, 2009. We saw it again in 2014 vs. Montreal. That 2014 team had no speed up front and had trouble even getting across the Hab blue-line at times.
Fast forward to now and the past two years the number of regular season games I watch (Bruins and league-wide) had greatly reduced. But even still, when I did watch I'd be struck by how slow the Bruins were up front and questioning how their record at the time was so strong.
Slow up front may work in the regular season. But in the playoffs, you need some of that greasy speed among your forward group. You need to apply pressure, force mistakes, get to loose pucks quickly, and speedy players if they aren't terribly physical in the regular season, suddenly now they are in the playoffs.
I thought it was clear after last year's playoffs the Bruins needed to get younger and faster up front. That's where this league is headed. Big and stout on the back-end, fast and furious up front. And in the off-season, it wasn't addressed at all. Most of the guys they brought in (Lucic, JVR, Heinen, Brown, Shattenkirk, etc.) all average-to-below average in the speed component. That has to change this off-season.