I agree with most of this. I had 15 years of hands on management, and it's the toughest gig in the world imo, in any industry.
It's worth remembering also, that some managers are better than others at getting people onside quickly, and selling a vision through the force of their personalities. Others may take longer to get their ideas across. That doesn't necessarily mean the ones who make an immediate impact are better managers in the long term - forceful personalities can start to grate after a time, whilst quieter people who take longer to win you over, often end up inspiring greater loyalty and trust.
But in modern football, who has patience, and who has loyalty? Underrated values that may be due a comeback? We'll see.