What top end talent do Carolina and Boston have? Pastrnak (#25), McAvoy (#14), Aho (#35), or Dallas Heiskanen (#3). Florida has Barkov (#2), traded/signed everyone else on the roster. Same with Vegas.
Meanwhile, NJ is 5 points behind the Flyers, Buffalo 8 points.
It's less about drafting high year after year than good scouting, development and trading.
Either Briere is smarter than average, and the Flyers are in good shape, or he's not, and tanking would end up with a mediocre team that makes the playoffs and doesn't get past the 2nd round.
Imagine after all those high picks, if Edmonton doesn't luck into McDavid, they'd be worse than the Flyers are right now.