I might be out to lunch here, but, as I’ve been going through and learning I think I’ve come to the realization that blender isn’t a one size fits all type of program.
I just went through the same course and had to disable clamp on a few things and enable it on others.
I discovered through the macro course that there were things like booleans that Kent had his set to exact but for whatever reason, mine only liked to work in fast. But only for half of them.
Anyway, the TLDR is, play with the settings, sometimes what the instructor does works, and sometimes you need to fiddle with some settings to get it going. I’m sure this hasn’t helped haha, but just one of my observations over the last couple months.