Their defense and goaltending is too good IMO. They aren't like FLA last year where they were high scoring but didn't play D and didn't have great goaltending. Or even like TBL in 18-19 where they were scoring at an insane rate, but just good, but not great at at preventing goals and were giving up a lot of shots.
Boston isn't giving up a lot of shots, is the stingiest team in the league in giving up goals and is still scoring at a high rate.
Still, getting past the 1st round means TBL or Tor in the 2nd round and that's going to be tough for them.