alt Hacker News> Good at self-promotion == just good in most cases for most practical purposes whether it's factual or not, arguably.
This does not seem true to me. Most popular programming YouTubers are demonstrably great at self-promotion but tend to be mediocre or bad programmers who know very little, even about the topics they talk about.
If anything we have plenty of examples of where being good at self-promotion correlates inversely with actual skill and knowledge.
With that said, I wouldn't classify Brendan Gregg as being good at self-promotion.
In terms of their compensation though, it functionally doesn't really matter, and that's somewhat true for being a professional as well, it's usually only important how many people think you're good enough. A job is often as or more political as it is technical