I'm going to guess you'd have more software complexity to account for more dynamic conditions, as OP's link alludes to, along with more redundancy in safety. I'

I'm going to guess you'd have more software complexity to account for more dynamic conditions, as OP's link alludes to, along with more redundancy in safety. I'm pretty sure most 4 motor drones can function fine with just three blades/motors and possibly two even. Source: I'm an expert flyer with dozens of seconds flying. I once bought my kid a tiny 2" drone and eventually took over as pilot. Now I didn't take it from him, he just stopped playing with it (What's wrong with kids these days? I would've loved it as a kid) but those little things are so fun to fly.