I understand your point. If you read the comments section on YT where he responds to questions, you'll see that he's not dogmatic about it. He refers to it as a general concept rather than a hard and fast rule. But even in his originally-proposed ultra-minimalist routine (the "Big 5" in BBS), he hits the back at 2 major angles and arguably the chest, because shoulder presses do work the pecs somewhat at a significantly different angle. Perhaps I'm misinterpreting, but I think he was probably referring to more nuanced angles as being unnecessary . Some gym goers do several different exercises for a single muscle group. I think that's overkill.Too bad he didn't really address why people regularly do multiple exercises for a given muscle group to begin with. For example, I think many experienced lifters do multiple exercises because each exercise (if done intensely) makes them feel sore a day or two later in a unique area. But he is making it out to be that if you just regular bench presses intensely enough you'll hit all the parts of the chest, but I'm not so sure about that.
So for example, I noticed that my upper chest just wasn't developing at the same rate as my lower chest, so I completely abandoned doing regular and declined bench presses and these days I only do inclines. And I can tell that method works because I feel sore in my upper chest a couple of days later in a way that I never feel with the regular and decline presses, and also because I can see my upper chest filling out over time.
But isn't that essentially hitting your chest from different angles with various exercises?So for back I would do pullups and rows, while for chest I would do dips and slow, full-range pushups with feet elevated and arms not quite locking out at the top of the movement. And since I do pike presses in a similar fashion for shoulders, there's a bit of chest work in there as well,

But isn't that essentially hitting your chest from different angles with various exercises?![]()

What do your workouts look like now?In late 40s without TRT yet that doesn't work at all for me now. 1 set a week, I wouldn't even look like I lifted.