The usecase requirements for an umbrella are not just hovering over the person, and I suspect even that core requirement might not be met in windy conditions.

The usecase requirements for an umbrella are not just hovering over the person, and I suspect even that core requirement might not be met in windy conditions. The other important specs are its weight and space requirement, handling requirement, cost, ease of operation. If it regressed in all these specs compared to the standard umbrella, then it already failed to be an innovation.