It's missing the value-add of valet parking - being able to pull up at the front door and walk away from your car. Without that, this is not valet anything. You still park then shuttle to the airport so there's zero benefit to the end user.
On the other hand, it leaves the car locked the whole time, no valet having your keys, no valet adjusting your seats, etc. Some of us avoid valet for some of these reasons.
If this thing could pick up my car from curbside at arrivals dropoff like a valet, but handle it robotically so there's no valet downside, it would be amazing.
loading story #49060997
In some places, it's no more convenient, and the value-add is just that you can pack cars in tighter. In Manhattan, for example, it's common for valet parking to be cheaper and less convenient.