You state, As someone who deals with psychology it makes me think that McVay and Snead (maybe just McVay) ignore the effect their decisions have on players. The expectations on them to "not be affected" by the demands on their psyche.
Not that long ago Mcvay left a player in who was begging to come out, exhausted, sent him into the endzond demanding that he execute; he tried hard but got picked from behind. Coach tends to overlook the physical condition (and no doubt mental condition of his players.
He can motivate. He can bond with his peer age group. But in my eyes he gets so hyperfocused that he loses sight to some extent of such things as the overall flow of the game, who needs to come out for a blow, who's ready to play and whom isn't, and what the actual capabilities of the players on the field happen to be.
Dick Vermiel said that delegating effectively is the sign of a great leader. That has to do with who you choose and how you manage them. Don't be afraid to delegate, he said, especially to people who can perform a certain task better than yourself. Then manage by holding them accountable to high standards while letting them do their jobs.
If nothoing else, Vermiel was in touch with his players and manaaged in such a way as to get their best from them. He did that through his subordinates.
McVay is a young coach and a genius one at that. I admire tremendously what he has accomplished so far. I'd much rather see him grow in the direction of Vermiel or, say, Bill Walsh, than another Mike Martz.