I completely agree.
Firstly, Boyle did a breakdown on NHLNet about how many more carry-ins Laf has this year previous seasons where he would just dump the puck in. That also aligns with Bread's take. The takeaway is that he's carrying the puck with confidence because he has a plan. There was never really a plan after "getting the puck deep" which is a direct indictment of the coach, along with the directive that playmakers don't make plays they get pucks deep. You're not getting the best of your talent with that dumb down shit.
Are the other hand, I also don't think any other coach would have changed the power play or put Lafreniere ahead of anyone else in the lineup, so that responsibility doesn't lie with Gallant. He just did the logical shit that anyone else would have done.
That said, knowing what we know now, had he stuck with Lafreniere on the right side for more than 30 seconds, this process could have begun last year.