I disagree. Those subs are chock full of people who suffer from "expert beginner" symptom. The real experts have moved on to communities with a higher bar of entry (mostly forums). You can't have real in-depth discussion about technical subjects when you're constantly getting buried by people who are mostly trying to score internet virtue signaling points by pointing out that their table saw is old and lacks the most modern safety features or that they're not using jack stands. Forums (or 4-Chan, or anywhere else with linear, non-ranked discussion) doesn't have that problem. Once you're above the lowest common denominator in any sub there's little left to gain because you can't reliably interact with people who are at or above your level (because those people get drowned out so they start keeping their mouths shut or leave entirely).