Haven’t watched the videos, but in response to your last question,
When I was trad, all I used was an applicator, 14 inch squeegee and a bucket. Oh and of course a ladder. I had no need to BOAB or any other nick knacks, for 8 years that served me perfectly.
I’ve never understood why these people go out looking like there about to go to war. I kept it simple, so did my work mate, we flew round!
We used to have stanly blades in the van ready for concrete bird muck, and that’s about as ‘accessorised’ as we got!