In some cases gradual change is reflected in the fossil record but quite oft you can see rather rapid change, once again, in the fossil record. The rapid change seems to follow extinction events where many niches are relatively vacant. Horses have a rather short evolutionary history. That’s like many stressed creatures. How exactly do grapes differ from any other species that has been breed for change by humans. Ie. Wheat, rice or hazel nuts to list a few.
Gradual change to a higher form is not what the fossil record reveals.
Non sequitur. Grapes still yield grapes; and thorns still yield thorns, never grapes. Variation is always within design parameters, never fundamentally changing its nature.