Your view of what constitutes a tool is overly broad. An OS is not a tool. A hand plane is a tool. It’s sharp and does one thing. The stuff an OS does might enable tools, and it may contain many tools, but it is not itself a tool.
Blending is just one of the functions of a food processor. A food processor can usually also do kneading, mincing, and slicing, or (depending on extensions) even rolling (pasta) dough and squeezing citrus fruits.
