The video seems very skewed to his perspective as a mythic raider that crushes content very quickly. Preach assumes that progress will take 2 or 3 weeks to finish their goals and then they're done. In my experience progress takes several months and gear isn't even that relevant for most of it.
Gearing up in one week at the beginning of the next tier? I don't have time to run 30 mythic+ in one week, and I don't even want to. It's not realistic to assume that everyone will catch up instantly when a new raid comes out, just because it's "possible" to do so. And no answer will please everyone. You will always have people dissatisfied with the rate at which they acquire gear.