Googling has gotten really hard. I used to be able to really nail exactly what I wanted, craft queries that'd "drag" obscure pages up to the first couple results by picking words likely to be used in links to those pages but rarely elsewhere, that kind of thing. No longer works at all. Attempts to narrow with quotes and phrases end in "no pages found" (bull. shit.) It's like they downranked everything not on the top 500 most trafficked sites so hard that they dropped right off their index entirely. Except blogspam. God they love blogspam.

Google removed their discussion-search feature some years ago, any idea why?

Maybe because blogspam loves AdWords :)