If you search YouTube for V60 brewing videos and guides you’ll find about three billion different ones. Some with agitation, some without; pouring fast, in the middle, making circles; 40-60 or 30-70 or whatnot.
I always think to myself that they’re mostly just fluff.
It all depends on grind size and temperature. Doesn’t matter how you pour (well, within limits I would think) as long as you get your temps and grind right for the pouring technique you’ve chosen.
Admittedly, I haven’t tried a ton of different ones, maybe three or four. But this is the feeling what I’ve got.
Maybe there are some edge cases, like Ethiopian coffees being more prone to clogging the filter so less agitation might be a good idea.
Oh no, I guess we have to tell all the scientists in the world that if their processes and procedures don’t conform to your standards and make complete sense to you that they wasted all their education because they aren’t doing real science. Lol, the scientific method and process if done right will work to eliminate bias, but eliminating bias isn’t the sole purpose. The main purpose is getting good reliable results that are repeatable, even if the result disproves their original hypothesis.