Humans develop slowly (long living with few children making long time between generations) than many other things (more rapid generations, more generations in same time) thus things that depend on their seeds to be spread become better more quickly than taste develops also the ones successful in that spread more.

In addition human culture consciously breeds the good fruits etc. just look how some plants have been turned into monocultures. Most bananas we buy are clones of a variant that was deemed good. For other things humans did centuries or even millennia of selection.