I would rather a business used a proper professional piece of equipment, not some cheap consumer mobile phone with a add on plugged into it.
Something that won't run out of battery, stop working when it gets wet, or shatters when it's dropped on the ground.
Proper equipment will be rugged, hard as nails, last years, and tested in the harshest of conditions costing thousands.
Sheesh, really.
For you.. but how about for some people (starter) that can't buy $10k professional equipment... iPhone is good enough... btw.. even Bentley are starting using iPhone/iPad for creating video ads.. which result is close enough for using $100k professional video equipment..
Sheesh, really. The world doesn't revolve around on you.