Somewhat tangential but I believe Google Search is going downhill, they seem to be losing the content junk spam SEO fight. Recently, I've had to append wiki/reddit/hn to queries I search for because everything near the top is shallow copied content marketing.
> they seem to be losing the content junk spam SEO fight Google clearly isn't even trying. So many of these sites are polluting search results for months. It isn't a case of sites that pop up for a few hours until Google notices and blacklists them. Google Search has gone so far downhill. I'm not sure what they're optimising for. Long-term irrelevance, it seems.
I assume they're optimizing for the most common denominator: standard, non-power users. Early search didn't return great results for human-like questions such as What are the wavelengths of the colors on the visible spectrum? The result might be within the first two pages, but that query had too many irrelevant search terms. A better query would have been wavelengths color visible spectrum. That query only has the necessary key terms. Sometimes queries required the user to know search operators (e.g. exact match, date range, synonyms) just to get relevant results.
The average person probably didn't know that early searches gave better results when constructed in the second way. Google changed search to adapt to how normal people search. Now the human-like query will return good results. Combine that with locales, search history, and personal interests, even the most basic user can get worthwhile results from asking Google question. The cost is that power users who understand operators and the power of key terms get less relevant results but likely still correct.