I have so many thoughts, I'll break them down into a few posts!
I HATE that so many NHL organizations pat themselves on their backs for 'DEVELOPING' a player. Truth is, the work you did as a 5-18 year old is all on the athlete - and has nothing to do with the NHL club that called their name. If you make the NHL as an 18 year old, it has NOTHING to do with a 5 day summer camp, and everything to do with your earlier life. If you play your 19 / 20 year old seasons in Junior, NCAA or Europe, then you'll grow there.
Truth is, ALL PLAYERS get better with age until about 21. Your body, coordination and strength improves. Whether or not you were drafted by an NHL team, or went undrafted, 99% of players will see an improvement in their game as they go from 18 to 19 years old.
OK - so how does a player grow? Patrick Kane spends his summers (and some in season) with Darryl Belfry to work on real skill that improves his game. So does John Tavares, Auston Matthews, Crosby and many more. Adam Oates has a large stable of players including many Jets players. Connor McDavid is a devout follower of Power Edge Pro counter movement training. So is Cole Perfetti, and MANY more NHL players. BioSteel runs two week skills and tactical camps that attract top end players. Gary Roberts has the market cornered on plyometrics, explosiveness and overall fitness. THIS IS ALL PAID OUT OF THE PLAYERS OWN POCKETS. They PAY their OWN money to develop their skills in the offseason.
Sometimes, there is no room on an NHL roster, so players play in the NHL. Do they grow? Yes, of course they do. They would also grow in Europe or other leagues.
Truth is, Maurice (and all NHL coaches) are there to coach a cohesive structure. When it comes to individual development, they're no more than puppeteers that can give or take away opportunity. They can play you with talented linemates or healthy scratch you. NHL coaching tactics for young players is mostly fear based mind games. Being in a position of power, they absolutely verbally and mentally abuse young players in compliance. It would not be tolerated in any other form of society, but somehow is accepted in all sports.