Re: A less biased system
Wandering off topic, but there's a really peculiar feature of Amazon that if you choose to sort by price, frequently most of the search results disappear and return if you search by "relevance" - which itself seems to vary randomly between increasing and decreasing. Still not as bad as Netflix - which I tried briefly - which seems to pride itself on making it impossible to find anything you might want to watch.
But the point about all of these algorithms is that they're explicitly not about serving the needs of the end-user, they all have an ulterior motive. Allowing you to more precisely control the results would undermine the purpose - it's not a search service, it's a nudge service.