This sounds incredibly legit, but question: Could you not gain a shit ton of momentum sailing directly with the wind in a regular boat, then drop your sails and steer into the direction of it to maintain some amount of velocity for an amount of time? Feels like the same principle could be applied here, especially because they would swap between photon momentum and gravitational momentum
For what it’s worth, wetting paper filters is usually done with near boiling water in the chemex, so it IS preheated with the regular process. Preheated steel also won’t retain as much heat. I don’t disagree with your post as written, it just doesn’t match the reality of what’s usually done