Spoiler, its RDT
In case people do nto know what RDT is, which they really should if they have been into coffee for a little while as it makes a big difference:
RDT is Ross Droplet Technique, which is very much adding water to beans. Named after David Ross who came up with it back in 2005
My favorite part of that paper is that thanks to them actually measuring particulate size we now have empirical proof adding a small amount of water improves the consistency of your grind:
it is clear that the inclusion of even small quantities of water (as low as 5μLg−1) results in an immediate reduction in electrostatic aggregates of boulders and fines