So someone will get wet when the door is open. Rain is going to come in, especially in windy weather. It happens on other cars and Tesla never said they solved that!
One interesting test would be when the vehicle roof is covered in water from heavy rain, and the vehicle travels into a dry area with the water still on top (for example, it's raining in the city, and you pull into the arrivals area of a hotel which is completely under cover). The question is, when the falcon wing doors open, will any of that rainwater drip or run into the interior of the car? The same test can be applied to other vehicles, and I'm sure if any other vehicle was particularly brutal with rainwater running inside the vehicle, it would gain a reputation for it.