I am going to take this in another direction, and not just to be contrarian or devil's advocate. Florida was the better team in this series. Last season, FL had the best record, 58 wins/122 pts, but lost (swept) in the second round by TB. They had a really bad start but were a good team down the stretch. I don't know what specific injuries they had earlier in the season but this team that played the the Bruins in this series was much more like a 58 win team than a 8 seed. They brought forward pressure and the Bruins could not handle it. What I saw was a team that played better against the Bruins than any other team all season. Don't be fooled by the 8 seed, that is a good team.
There were 3 very important players (in addition to the obvious goalie issue) that did not play some games and/or when they did play, they were not playing at the level you would expect, Bergeron, Krejci, and McAvoy. Bergeron and Krejci were hurt enough to miss games and they were not 100% when they came back. They are old but were still top players all season, centering the top 2 lines. They were not playing well. Essentially losing your top 2 centers is a huge loss. And McAvoy, is a top defenseman in the league and he played well below what you expect. I am not sure what the issue with him was. It would not surprise me if some injury is revealed.
As to next season and beyond, I suspect that both Krejci and Bergeron are going to retire. That is two huge holes to fill. But we did win a couple of playoff games against a really good team without them. We have to see who we are able to keep but Pastrnak, Hall, Bertuzzi, DeBrusk, and of course Marchand are all good players. If we can keep Orlov, our defense is actually going to be really good. And we have 2 really good goalies. I doubt we have the best record in the league again, but this team is not going to drop off a cliff.