IMO search has had its goalpost moved. It used to be about scale, technical challenges, bandwidth, storage, etc. It is still about that, but a significantly harder challenge to solve has come up: searching in a malicious environment. SEO crap nowadays completely dominates search, Google has lost the war.
Simply put, I believe that Google sucks at search, in the modern context. It is great at indexing, it has solved phenomenal technical challenges, but search it has not solved. Why do I have to write site:stackoverflow.com or site:reddit.com to skip the crap and go to actual content? Why can my brain detect blogspam garbage in 0.5 seconds of looking but billion dollar company Google will happily recommend it as the most relevant result above a legitimate website?
I feel this 12 year old XKCD is still relevant: https://xkcd.com/810/ .