As a side effect, it should really help Google and other search engines to rank those websites. External links of good quality still the best SEO.
I think the biggest problem isn't so much find "hey, that's a cool article"-type of content, but typing in [programming concept] in Google. What I want to find is things like in-depth experiences and advice regarding this which complement the manual. What I actually find it loads of "howtos" with "copy this" which just rehash the manual.
Results vary a bit depending on [programming concept], and I don't think simple "getting started with"-articles are completely useless either. But generally speaking, there are too many of them, many of them are not of high quality, and it obscures more in-depth content.
I'm not sure if maintaining a list of links would really solve that. Perhaps community projects like "awesome-foo"-lists have some potential here, but in practice I've found many of them to be dumping grounds rather than carefully curated.
But I fully agree, people should be creating their own ecosystems with links, rather than keeping huge portals happy.
Our current solution is to rely on magical black box algorithms to give us the diamonds, but it's been creaking for a while.
I'm not sure how to make this better: one person's turd is another person's diamond, and people trying to game the system will always be a problem.