Several people have noted that it feels like there are fewer high quality posts
And many others have not noted it. For example, to me the quality of posts seems as high as ever before. Possibly even higher!
Specifically, these "several people" who complain about quality, like bd139, themselves do not produce high-quality content at all. I don't understand why bd139 is some kind of cult character to some, I probably missed some subforum completely, maybe some social bubble, but going through his recent posts the only longer posts are political rants and personal attacks; technical content is simple one-liners. Before the recent posts, I remember him from earlier complaining and an earlier ragequit, then comeback (hopefully I'm not mixing him up with someone else, if so, apologies!)
At the same time, we are seeing great technical discussion with a lot of insight from people like Nominal Animal, SiliconWizard, brucehoult and
many many others and that has not gone anywhere. And people like peter-h are great "discussion starters" or "drivers"; they ask the right questions in a way which pokes people to share their insight.
Discussions involving analog electronics, power electronics etc. have not changed much for worse or better. The same mentally and technically very stable people seem to be discussing them, just like 10 years ago; I don't even need to mention their names. In programming and MCU related stuff, I can see that the Q&A site nature, specifically "how to download IDE and make a led blinker", has changed to much better with wider and deeper programming mindset (for example, Nominal Animal's posts). EMC/grounding related discussions have suffered as T3sl4co1ls contributions slowly deteriorated (IMHO) but thankfully he was not the only one discussing those; and I can see that enough new people have learned something to keep the discussions still going in a similar direction. We don't absolutely
need T3sl4co1l to tell us anymore that MLCCs lose capacitance under DC bias, ferrite beads saturate, and split ground planes and USB shield magic components are usually colossally bad ideas. I mean, people like wraper, ataradov etc. can tell you all that. Or me. But I do miss the verbosity and going-deep-but-not-too-deep into theoretical math style of T3sl4co1l. Losing that part is a shame.
Or think about Someone who is always ready to correct, usually with actual data sources (something most people don't bother doing), misconceptions related to renewable energy, HVAC etc., pointing out where the logical fallacies are without ever resorting to personal attacks.
All in all, in my opinion the quality of discussions here is still excellent. It always has been, it still is. Maybe it's 25% better for some, and 25% worse for some other, depending on your personal weigh factors and biases. But any variation during these years is small. I don't buy the claims of having to leave the forum because of supposedly
collapsed quality, that's utter BS. It's an excuse, possibly unconscious, possibly conscious. As I said before, people lose interest, come and go, and that's normal. The phenomena of ragequitting with heavy personal attacks against nearly everyone, and the lighter version of complaining "this isn't as good as it was before, bye", are older than the Internet, and there rarely is much truth in those arguments.