MWJB so in the post you linked by Smrke, he suggests the variance between grinders is entirely down to the size of their burrs, not their verticle/horizontal orientation. He also cites a lack of data.
Try using an EK43 without rdt and see how you get on, fines all collect in the chute and axle as there’s way more surface area for grinds to creep in to compared to the Monolith. Even compare their grind chambers and it’s immediately clear which one was designed for single dosing and which has been modded to do it. Ek still makes a cracking cup of coffee 👍
