I kinda wish there was a sort of proper blog-DMOZ. Would make this sort of stuff a lot easier. Right now everyone and their grandma is curating their own blog list. Lots of wasted effort that could be saved by collaborating somehow.
Curation is still hard. Also, I personally don’t mind having different curated directories because those will reflect the taste and interests of the curator.
Right now everyone who is running any sort of curated discovery service needs to answer these same questions about roughly the same site.
Could be done, but it'd take time and effort.
And if the answer to that is no, then where do you draw the line when it comes to quality?
Curating anything is complicated and different people will have different opinions which is why you end up with different lists curated by different groups of people with different ideas about what should and shouldn’t be included.