Sorry for the following essay... but you did ask..
Simply put, the team is winning in spite of the coach. But outsiders don't see that... they just see a team that is now in a playoff position after a crazy hot stretch of play and after missing the playoffs last year, and assume that the coach played a part in that.
He didn't.
In reality, we just have some awesome players who are having crazy years.
Giroux is tied with his career best in points (93 points)
Couturier has nearly doubled his previous career best (previously 39 points, currently has 71 points) while being elite defensively
Voracek is 1 point away from tying his career best (81 points)
Gostisbehere hit a career high with 60 points, which is good for 4th in all defensemen scoring, while also being really great defensively
Provorov's great at contributing offensively at 5v5 (pretty bad on the PP, to be honest) and is 10th in defensemen even strength scoring (32 points) and 2nd in all defensemen goals (15)
Konecny, since the idiot coach stopped ****ing him over by playing him with 4th liners and like 10 minutes per night, has caught fire (19 goals and 32 points in his last 39 games)
Sanheim is finally back in the lineup but currently stuck with Andrew ****ing MacDonald and being horribly misused by the coach, but apparently his advanced stats are incredible (I'm personally not interested in those stats, so you'd have to ask someone else) and the eye test is backing that up. The scoring isn't there yet, like Patrick, but he's been fantastic in his ridiculously little playing time.
And then
Patrick... not reflected on the scoreboard, but truly playing incredibly well for the last few months and is making me much more excited than I previously was about him. I wouldn't be at all surprised if he was already our best scoring C next year.
So 6 of our top 7 scorers are having career years... and Patrick and Sanheim are looking awesome, despite a lack of points.
THAT is why the team is where they are.
Meanwhile, we have a coach who severely under-uses most young players (Konecny, Patrick, Sanheim, etc) and severely over-uses atrocious vets (Lehtera, Filppula, Manning, MacDonald, etc).
He also likes to bench the guys who helped get him the lead (Konecny, Sanheim, Gostisbehere, etc) at the ends of games and go full on turtle mode... double shifting guys like MacDonald because he's "safe" and "reliable"... which has resulted in this team going to OT 24 times in 78 games. It keeps biting us in the ass and he keeps on doing it.
There's a million other things he's doing horribly wrong, but this post is already long enough and if anyone cares they can check out the "Fire Hakstol" thread on the Flyers board.