My writers' group's course junkies have attended a huge variety of courses, ranging from University degrees and week-long writing holidays down to one-day workshops. They never have a bad word about the courses, saying that they're hard work, great fun and they learnt a lot. However, they're still attending the writers' group and, at best, are still stuck at the 'self-publishing for a handful of sales stage'.
In my case, I've always been skeptical because most people who frequent 'writers groups' never seem to complete their books. Instead, they read a passage, and everyone picks it apart, so the author ends up second guessing every decision they make, continually coming back with revision after revision, adding more and more crap to their stories until they become too ponderous to float. In the end, the story becomes so boring, even the authors can no longer read them.
In trying to reach out to other authors in my local community, I attended several local authors groups. I found a similar situation: a workshop lead by a 'failed author' (someone who'd only written one or possibly two unsuccessful books, but hadn't written anything since, leading a bunch of people who had no clue what they were doing and were wasting their time fretting over form rather than focusing on the story itself.
I can't complain about 'people who are stuck at the "self-publishing" stage', because that's exactly where I'm at, simply because I have no desire to write exclusively for publishers, but like many here, the work groups tend to get bogged down in details, rather than simply cranking out the story.
My advice, if you want to write, then write. If you want to discuss the craft, then discuss the craft.
By the way, I've long maintained that the various LinkedIn Authors groups (before LI yanked the rug out from under them and most abandoned the site) are much better at discussing the craft of writing than forums like SOL is. That's because they're populated by individuals who are serious about success in writing, they're hungry for advice from people who gone before them, but most importantly, since LI is populated by people's employees, future employees and publishers and requires read names, not pseudonyms, NO ONE trashes anyone else and everyone is exceedingly polite to each other!!!
Even though the groups aren't what they used to be (with fewer authors contributing, most of the entries are self-serving promotional pieces), the conversations and posts are still much better, honest and useful than what we get here.