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
What utter garbage.
Any community particularly one for nerdy hobbies has jargon as part of it’s discussion and doesn’t have explanations littered in every instance jargon is mentioned. Part of joining in that community is asking or finding out what the jargon means. Asking like an entitled ass over not understanding jargon in a hobby you aren’t familiar with shows what sort of person you are.
Again, I answered the question when asked.