Agree with all points.
I'll add a bit about my own experience. It's not football-related but employment-related. I used to work for an organisation that made our board look like they were run by Nick Politis. We were going through a series of retrenchments, and several of the staff I managed were on the chopping block. I argued why they should be kept, but to no avail. Management had made their decision and I was expected to be there when they were called in for "that meeting", along with the head of HR. I made a point of seeing these people before for a quiet coffee and explained what was happening. I also explained they would get a redundancy package, and there was no way management was going to change their mind. They knew full well how management operated. The meetings came, and the inevitable happened, but I knew they were all capable people who would find employment in no time. I was asked to be a reference, and all were happily employed within a few months. I still talk to these people to this day.
I thought of resigning, but I still had a few people I managed, so I decided to stay and do my best. One day, I was called to a meeting, and sacked on the spot ala Holbrook. No warning at all. The opposite in fact. I attended a meeting just a few days before where management showed the new structure of the organisation. I was listed as having increased responsibilities on the org-charts, and yet gone just a few days later.
So, is it better to have some degree of warning, like hook, or just executed on the spot, like Holbrook? I would take the former every time. From a professional perspective, there is nothing worse than being in that situation that Holbrook found himself in where employment is brutally terminated with no warning.