I feel the problem with Vogel was a defensive coach with offense skilled players trying to mold them into a defense oriented team. He literally was trying to fit square pegs into round holes.
Exactly and this was the same problem he ran into with the Lakers. They were a title team and then they traded for a big 3 concept with Westbrook and it all went to crap. Vogel is definitely a coach you bring in if you have defensive players.
The thing is he did extract defense. That's my point. The Suns last year got only 20 games out of the big3 and still ended up winning 49 games. Their defense was a lot better than this year. Last year the Suns are 13 in the NBA on defense. This year they are 24. Now imagine if you actually had a GM that knew he hired a defensive coach and gave him some elite rim protection (Nurkic is not that guy) and some defense on the ball at the point. Around the big 3. Sure even then the big 3 likely does not deliver you a ring because they never stay healthy enough and I'm not sure any of the 3 are really are a #1(leader) on a title team. However if you hire a coach give him the players his system needs.
We had Ayton, we had some pieces to move. We turned that into Beal, Nurk and Grayson. Those pieces won't make you a defensive powerhouse around KD/Booker. This is just a bad run FO. Instead of making some moves for youth and athleticism we trade for more mid career slow players like O'Neale. We just didn't roster build around KD/Book properly. Especially if you added Beal, you needed much better defensive and athletic players than we got. Then we blamed Vogel, and hoped Bud would be the savior. Crap management.