High-quality food processors can handle hard root vegetables like sweet potatoes without struggle. You can even swap out attachments to dice, slice, and spiralize sweet potatoes in a food processor.
A food processor can absolutely be used to mix ingredients together, much like a conventional stand mixer.
A food processor takes over the tasks of mixers, blenders, grinders, choppers, grain mills, graters, pestle and mortars, and several more tool kitchen tools and appliances.
Some Ninja blender models that come with a mode for chopping fruits and vegetables and kneading dough, similar to what a food processor can do. There is also a Ninja Kitchen System that comes with a food processor that accommodates up to 8 cups of ingredients per batch.
Food processors come in an assortment of sizes, ranging from small 3-cup models all the way up to 14 cups. However, the exact size range will vary from brand to brand.