Agree with experimenting, but also appreciate the experience of others and an understanding of the physics as that can help me buy less stuff and save some time.
For pour over the shape difference between flat and conical is noticeable, but that's not surprising as the way the moving water interacts with the filter and grindbed is substantially different. For immersion, where you are Just holding the water in contact with the entire bed and then draining down through the filter, I have a hard time grasping that the final few seconds of draw down makes much difference relative to the minutes spent in suspension. I've been wrong once or twice before though.
I kinda gave up on rss awhile ago when it seemed like feed availability was dropping and Google dropped support. Disagree with author that the reader doesn't matter. It can really shape your experience. Appreciate good recommendation for something that doesn't cost $2 a month.