One of the key tenets of a quality per cup is repeatability. A big reason we teach our method is because it is highly repeatably with the correct tools and an attention to detail.
What we have found though is that having a few extra tools helps. For the Hario Buono kettles, a flow restrictor can be very useful in getting a steady and consistent pour volume over a fixed period of time. I often find myself cringing at the aggressive pours I see from some other industry people which begs the question, why are they even using a kettle if they are going to pour it in there like that?
On the other end of the spectrum is the new Lb-1 which should come out in the fall. We have been playing in shop with it's dynamic temperature adjustments but also, having the flow controls is an exceptional benefit. Being able to dial in the exact ounces per minute to get the flow rate we want for each brew method and then directing the water where we want it is a tool many would love to have. It makes for a very repeatable brew by guaranteeing the same volume of water always flows through as long as the timing is the same.
That's something lacking from a lot of manual methodologies like consistent volumes of water, not to even get into how few people are focusing on temperature control.