Coaching and lack of an elite C/F
And goaltending
And lack of a true #1 D
So... everything then?
Like I don't disagree with you that those are all probably part of it but most teams don't have all of those things in spades.
Getting a Makar/Fox/Hughes/etc type #1 Defenseman in this league is almost impossible if you aren't lucky enough to draft them. Same with elite C/F... and goaltending.
Like it's incredibly rare to get those guys in a trade or in free agency. It happens but if it's via trade it's usually because the player forced their way out of town and are only willing to go to a specific destination. Florida is just about the only team that has gone out and spent an insane amount for an elite #1 G and much of that contract early on looked terrible.
So I think the coaching thing is likely due to the following...
1. Rod believes the game should be played a certain way and demands that of his team
2. He doesn't have the elite horses to NOT employ a super hard-nosed forecheck style strategy
I think they could probably loosen up on both of those points but not abandon them all together. You need to have flexibility to change things up and have a plan B or plan C if plan A isn't working. That's what the Canes lack and that is definitely on coaching, regardless of whether or not you have elite talent. You have to be able to adapt to the situation. Canes just do Canes things all the time no matter what. It works in the reg season again weaker competition and over a large sample size but the playoffs aren't that.