I think that most blenders are primarily used to liquify. Vita mix blenders can of course do more.
A food processor with enough power, like a Cuisinart or a Kitchenaid, or a Robot Coupe -- don't liquify as well as a blender, but they can do so much more: chopping uniformly, slicing, dicing, julienning, etc.
If you food processor has a food chute, you can do this without limitations!
I think each machine has a place in a well equipped kitchen.