At the risk of sounding like a crazy person in a likely torrent of doom and gloom: I'm not nearly as negative as even some of the wins against the Habs. Structurally, after a disastrous 1st period, the Flyers adapted and had the chance to take it to the Islanders at various points. They just could not finish/execute and momentum did them in with a couple individual mistakes. It's a 7 game series, and perhaps the Flyers can study what they did well. Yes, they're stingy and Flyers can manufacture more second chances, but this Islanders team is beatable.
Now, while obviously the top players need to finish some plays, when you dress a lower skill lineup and struggle to score at 5v5 all post-season, that's self-inflicted too. Islanders got ES goals out of their 3C and 3rd pair Methuselah defenseman. To the Flyers credit, that new look Laughton-Grant-NAK line actually did very well, and so did Ghost-Braun (scapegoating Ghost would be a terrible mistake when he was one of the absolute best players). The Hayes line showed positive too, especially TK. Thompson did what he usually does (with his ice time when trailing scarily even with other lines), and the top line/Sanheim-Myers pair were hemmed in too much and were at the bottom in the metrics. You do expect that to change. Well, not the Thompson part.