> Software that does not meet expectations, especially in a field like search, which is basically a long running war between SEO and search engines, is not a 'bug'.

While bug has various definitions, not meeting reasonable expectations is common to all.

> That's like saying there is 'bug blindness' in the publishing industry because when I pick up a random book, it sucks

No, because there's no reasonable expectation that a random book won"t suck.