In my experience, it depends a lot on how much competition there is from content farms. If your niche isn't targeted by those, it's easy to find the good blogs. Otherwise, it's very difficult.
I suppose that this is a use case where ML could help a lot to recognize "content farmed + SEO optimized" content. Hopefully Google could improve the situation in the future - supposing they are trying.
One of the most entertaining "bugs" that popped up recently while I was looking around for some opinion content that I would _hope_ is recent was that one of the content farm sites plagiarized a rather good blog post, sentence for sentence, for pages and pages. Instead of "I found that ..." they'd thinly-edited it to "Now, let us find..."
The annoying thing was that the content farm appeared _above_ the original content.
I suppose that this is a use case where ML could help a lot to recognize "content farmed + SEO optimized" content. Hopefully Google could improve the situation in the future - supposing they are trying.