Disagree. The problem with Vogel was the players refusing to listen to or respect him, and that's more their fault. An adequate PG wouldn't have caused their attitudes to all change.
The team needs/needed leadership. Vogel was a proven elite defensive coach who made a bad Suns defensive team that had many injuries play pretty good defense. There was never ever any time for the big 3 to develop some chemistry and continuity and then they played a very good Wolves team that was the best defensive team in the NBA. Just looking at the stats though, the Suns didn't have the big 3 for more than 30 games last season. Despite that they won 49 games. Their defensive rating was 13 in the league, offense rating was 9. That is top 14 defense and top 10 offense. However they drew a very tough first round match up. Wolves beat the Nuggets last season too.
Now this year with Mike, we're at the same 9 spot on offense rating. We've slipped to 21 on defense. Mike brings in some good schemes on offense, overall though the level of the team has been same or even a bit worse, in my opinion.
Vogel was a pretty good coach. He did not even have a point guard or the sort of defensive players he had success with in LA or Indiana. The Suns got a legit point guard after he left in Tyus. The roster was not well structured around the big 3.
Now the Suns are paying 2 coaches a combined 17 million a year, to both coach at the same level. It was very obvious to me, the players and GM Jones saved their behinds by blaming the coach. When you have a novice rich owner like Matt, he probably bought into that. Much easier to avoid the truth by blaming an easy target that you can replace.
Now the reality is setting in. Any coach needs:
Beal/Durant healthy next to Book to develop some continuity for the team.
Better defensive players.
A leader on the team
Suns should have never traded for Beal. It was a massive mistake.