Oboy, I'm going to start doing that too! I certainly don't mind lumpy. I probably even prefer it. In fact, I often use the food processor instead of the blender for precisely that reason.
However, I'd probably do carrots and beets in the blender first, then maybe add them to my bananas, various frozen fruit, and nuts in the processor. So glad you mentioned doing that!
And as you know, I've already used lots of spinach, collards, and at least lacinato kale. And Peanut has used regular kale, following my technique. Just be sure to liquefy it first in a little water, and your smoothie will be terrific!
Mmm, don't we eat well?