Re: Tippett's answer. He references LA as their best players not being their young players. But is that because LA doesn't really have any good young players? Do Pearson and Toffoli still count as young when they're 25?
Look at Toronto. Their best players are all young. Matthews, Nylander, Rielly, etc. Calgary with Monahan and Gaudreau (Johnny Hockey is still fairly young as this is only his 4th season). Anderson, Werenski, Jones, Wennberg, Dubois, etc. in CBJ. Forsberg and Fiala in Nashville. Bratt, Butcher, Hischier, etc in NJ. I could go on. These are all top teams or playoff teams.
Tippett could just be referencing young players stepping up for the call. The Kings have gone through a total of 21 forwards so far this year, vs. our use of 15, and even then Kempe and Crouse have pretty much gone down and not come back - these aren't injury-related usage.
I think it refers to the balancing act and players around the age of 25 or younger are still in learning mode - even Toffoli (169th amongst forwards in TOI per game), Fiala (227th in avg TOI), and some of the others that you mentioned are not getting 18-20 minutes per game. There could be a balance of relying on them more later in the year, but that also feeds into the "prove yourself" territory to get more minutes. Adrian Kempe is only getting about 13-14 mins per game for LA.
Maybe there are a lot more coaches in the league who don't use the under 25 year olds in a ton of ways, but there are exceptions (McDavid, Eichel, and others). We have a lot of youth that are getting forced into those roles, but Perlini, Fischer, and Duclair are all getting similar ice time to what "Dino Dave" gave them last year, so if Tocchet does a similar approach, and by all accounts, a lot of coaches don't necessarily throw the young players to the wolves, maybe it was for the exact reasons that were argued the previous year, regarding getting players experience without overwhelming them.
It doesn't necessarily have to mean playing a player 17-20 minutes in every imaginable scenario, b/c you can kind of wind up breaking a player that way. Look at the team this year - I think that one could argue that putting a bunch of young players in scenarios that may not be appropriate for them will inspire less confidence over time, and that may be what we are seeing right now.