This is the lab behind the poop knife. They are absolutely experts in this kind of thing.
I need to read the whole paper, but I suspect the weight/wind resistance ratio of the javelin is better, and that the motion of launching an atlatl dart is affected by the downward angle. The railing on the scissor lift likely has an effect, too.
I wouldn’t consider these huge issues, but there’s 3 areas where I think the miir design suffers relative to the chemex. The pourover part looks like just a single wall. Obviously the chemex is, too, but according to a quick look on wikipedia, stainless has ~10x the thermal conductivity of borosilicate glass, so your brew chamber is going to cool more quickly. No clue if it would be enough to make a difference in brew temp, though.
The stainless carafe part sounds good, too, but stainless travel mugs almost always get lots of coffee residue buildup, and it’s a bit of a process to get them properly clean to the point where you don’t smell it. I always end up washing with baking soda and/or citric acid a few times. Glass stays cleaner, and it’s also easier to see how clean it is.
Lastly, it might just be me, but every once in a while, my scale times out if I’m doing other stuff while making coffee, or I’ll make coffee without a scale. It’s really nice to be able to see visually how much coffee there is in the carafe.