Amazon search was never good, but it was not a problem before it got flooded with cheap Chinese crap.
The cheap Chinese crap makes Amazon worse, which results in loss of customers, which frightens the Shareholders (line has to go up), to increase the profit the management milks their cash cow (AKA cheap Chinese crap sellers) so more Chinese crap is in the site. The circle of life.
There is has been a long campaign to make Americans dumber. Easier to control and more perceptive to propaganda.
Look at the state of the education system. This happened not by chance but by design.