Here's my take on this....I think a lot of in game coaching is literally just...playing the guys who are playing well and sitting the guys who aren't..or at least adjusting the minutes as necessary
In game systems changes and the like are really hard to do...you need to have a lot of preparation before hand to set your game plan up...and then what...you suddenly change things up? Go from a 2 1 2 to a 1 3 1 at the drop of a hat? I think that's about preparation and having multiple systems in place depending on the opposition
There is no one size fits all system to hockey.
I've never put in a ton of stock into ppl criticizing avs in game coaching....I think that's hard.
My issue is with his system and his deploydent of icetime. If the system isn't working you can't just change it mis game unless you've worked on it in practice.
I'm not super smart hockey tactician guy but I think there's some amount of adjusting that goes on if you see your opponent doing something in particular and having success with it, or if you are trying to do something and they are preventing it. Then maybe you modify your gameplan a bit...it's not like you can completely switch systems in the middle of a game but identifying what's working and what's not for both teams and then trying to address that is probably a good start.
And I think AV *tried* to do that at times, but too often there was a lot of "just hold the course steady and keep working" that didn't...uh...work.
As for deployment and icetime...again, it's funny, I feel like the first couple of years AV did hit on something and that was with a team that had a lot of depth but no real superstar top heavy lines, he rolled them pretty evenly with a bit of a lean towards whatever line was playing well. But the Rangers basically had 3 scoring lines and a 4th line that chipped in and at least generated pressure. But towards the end it seemed like it was basically "spend most of your shift trying to get the puck back, then dump it and change and hope that the next line could get a turnover and get a counter attack chance" which ultimately was pretty blah.
One thing I'll be curious about with Quinn is how he treats Russian players. I really do think there is a bias against those guys from some coaches and I think AV had some bias towards Buchnevich that went behind wanting him to play better. I mean, I admit I'm reaching here, but I think some of the culture differences makes it a bit harder for those players and coaches to work as easily together as it is for a north american player and coach.
Part of my evaluation of Quinn will probably hinge on how well he seems to develop Buchnevich...the guy has a lot of talent and he didn't seem to get much coaching up from AV and seemed lost about where to go. Let's see Quinn help him reach his potential.