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
True but I would believe the general level of enthusiasm for a conversation about RDT would be substantially higher in a modern espresso group vs filter coffee folk.
Also my previous comment is bit of a inner monologue as someone who posted very randomly detailed things on r/espresso back in the day and rather uncertain if/where I would post that stuff on Lemmy.
If it applies to both I would still post it here as the community is bigger and would still benefit from it. Even for basic stuff as there appears to be far more total beginners than the subreddits in the other place.