First of all, you have to understand that internet and TV sports media--that is, those that deal with the major pro sports--are about 90% NY. So you are seeing everything through NY colored glasses. There is a distinct anti-Boston team attitude at NBC's Sportsedge, Yahoo sports, ESPN and MLB & NBA networks. MLB Network is mainly Yankees and Mets. The only semblance of neutrality at these networks are the ex-players and coaches who lend some degree of objectivity to the analysis. ESPN, for example, has been responsible over the years in drumming up and exaggerating all those questionable charges against the Patriots. Only Mike Reiss at ESPN-Boston (ESPN-NY is the problem) has been objective.
So take the "Athletic" , another one of those pay sites of largely NY sports analysts, with a certain grain of salt. Having said that, I do believe there was locker room dysfunction with the Celtics, and the coach undoubtedly was involved in some ways. Some ex-player analysts have suggested Stevens was kicked upstairs to get a new coach without having to eat his guaranteed $30 million contract. Makes a lot of sense. It was easy to get Danny to retire, since he had come to realize that the stars were dictating which teams they wanted to play for, and GMs had become outmoded. We are seeing that now in other sports. GB Packers, anyone?