Earlier quoted context omitted.
I'm afraid that, as so often with any topic, the vast majority of users never or rarely uses the time filter and so everything gets optimized for the users to dumb to search properly.
In this case I'm not too keen on blaming users for this when the option is sorta buried in the current design. The Tools button isn't prominent, the current value of the time range option is completely hidden when it's on the default of "Any time", and the search query doesn't change if you alter the time range option. (And, to my knowledge, there's not a search query incantation for specifying the time range.) If th…
Just like it was A/B tested that the best background color to contrast the ad area against the organic results’ #ffffff is #fffffe.