Outsourcing the credibility assessment to the link graph was the whole point of PageRank, because most people wouldn't know where to start with whitelisting sources for their query (and if they did, a general web search engine wouldn't be where they started).
If I want pg's opinion on startups, I go to his blog. If I want to find a venue near me, or the web presence for a company somebody has mentioned, or a description of a particular phenomenon I'm not familiar with, or whether a particular error message has been seen by other people, or where to buy something, or some information on a place in a foreign country or what Foo means, I don't want to start off by specifying who I trust to provide this information. And even if I did, I suspect I'd be disappointed by how little information Paul Graham, my favourite YouTubers and the Pope had to offer on any of these subjects.
Outsourcing the credibility assessment to the link graph was the whole point of PageRank, because most people wouldn't know where to start with whitelisting sources for their query (and if they did, a general web search engine wouldn't be where they started).
If I want pg's opinion on startups, I go to his blog. If I want to find a venue near me, or the web presence for a company somebody has mentioned, or a description of a particular phenomenon I'm not familiar with, or whether a particular error message has been seen by other people, or where to buy something, or some information on a place in a foreign country or what Foo means, I don't want to start off by specifying who I trust to provide this information. And even if I did, I suspect I'd be disappointed by how little information Paul Graham, my favourite YouTubers and the Pope had to offer on any of these subjects.