This is what makes the Kitchen Aid so pricey ($400 via Wayfair):
2 blending arms
It comes with: Blending handle, battery, charger base with adapter, blending arm, s-blade, star blade, frother/beater blade, bell guard, pan guard, whisk, chopper, pitcher, storage case, manual included
There are a bunch of online discussions about cordless drill immersion blender attachments, and the main concerns are contamination. There’s the potential for cooking fluids to splash into the tool, or contaminants from the tool to fall into the liquid.
There are ways around it, and I believe I’ve seen drills used in cooking competitions to mix up big batters.
Unless you absolutely need it to be cordless, you’d be better off with an AC immersion blender. And if it must be cordless, there are other brands that are sold with fewer accouterments.