Okay, after a few breathes, here are my thoughts.
The more I read into Hynes's time in the NHL, the the less enthused I am. He sounds like a Dean clone. He is stubborn like Dean; he is more of a systems guy than a guy who adapts his system to his players. And that can work - but only if theres no cracks - but once pieces start falling out, they fall like dominoes as can't adjust or making tweeks to your design or using some more unknown players to better situations. And he has a bitter taste than most unemployed head coaches.
Now with all that said, here is my "glass half full" side of me...
Apparently, he's a better leader and I never understood the Evason hands off approach. It was dumb, you need a person, one voice, to lead the group. Players can help excite the team but you need one guiding leader to take charge. Evason obviously lost it 1-2 seasons ago.
And I'm not sure I buy into the "he ruins young players" narrative. In Nashville, if your top prospects are Tolvanen, Tomasino, and Fabbro, there a bigger problem in your drafting. Those players would be 5-10 on our list. So I don't have the same fear when it comes to Yurov, Ohgren, Rossi, Faber, Boldy, Wallstedt.
And I think an interesting argument for his development skills is his time as the Penguin's key develop coach as the HC in their AHL affiliate, the time that BG is likely remembering when he chose to hire Hynes. I think an interesting take on a coach's ability to develop is mid/late round picks into a top six forward/top 4 dman, players you would normally have to spend a top 30 pick on. And he developed Brian Dumoulin and Bryan Rust when only had 1 Penguin prospect that was drafted higher than 20th during all his years there (Derrick Pouliot). The Pens had, and still have, a drafting problem so I find it hard to fault Hynes on that. They are simply one of the worst drafting teams in the league.
He also did good work with his some of his young talent with the Devils in developing Severson, Palmieri, and Bratt (left Hischier and Hall out for being 1st OV but still Hischier developed nicely and Hall had his best year under Hynes).
That said, I'm still very suspect of the hire as I'm not sure he's a big enough change to fix our problems and he reminds me too much of Dean to be happy but I am also not as doom as some others. I am definitely willing to see how it turns out.