The club wanted stability and consistency, part of that was the back room staff and the way the club was run.
Getting rid of Steele is the most questionable decision, especially considering the fact he's learnt spanish and it's pretty publicly known the praise there's been for how much he's helped De Gea.
Rene was offered to go back to his old role, head of youth development. He asked for time to think it over, unsure if his decision has been as of yet.
Butt has been at the club working alongside the reserves for the whole of the season. It's not known if Scholes is or isn't joining up, he was under Fergie but when asked didn't know if he'd be offered a role.
I wouldn't say bringing in Phil Neville as number 2 is exactly filling me with confidence considering it'll be his first coaching role at all and has not long started his badges IIRC.
Too much change at once for a club that has gradual change isn't going to do it well. I'm not sure about changing winning staff to staff that haven't dealt with the size of club, players etc before either.