Yep, substitution patterns and late-game struggles, IMO, are the biggest reasons you can point to the coaching and it being time for a change.
On late-game struggles, one can say that "well, at least they're not quitting and in games late, mostly against competition". True, but we are not winning ANY of those games. A decent play call or calming the waters would pull out 2-4 of those. We aren't getting any because of play calls, and maybe his hyper anxiety is coming across.
But back to substitution patterns. Plenty to dissect in those awesome charts
@TEvans4Three, but I'll critique from a higher-level view, not by individual minutes complaint- which there are plenty. But no way in game 20, game 25, should patterns be that irregular, unless there are foul issues, matchups, or injury. And if you go to a game, you can see how he has no plan or thought process. This past game, I watched him on numerous occasions overreact to an issue on the court, look at the assistants, pace up and down the bench, then come back and grab someone. Even worse, I noticed there were a number of times he would grab someone, send them to the edge of the scorer's table, then call them back. He would have someone go to check in, get a media TO, then someone different check in.
It's all chaos and no plan. And while his energy is great, I feel that contributes to the control issues, substitution chaos, and late-game collapses as players have no confidence.
And if he is that reactionary and inconsistent with substitution patterns, I gotta believe he's that way in other things that matter, too.