But this is not the case not just for Tesla but for most modern cars today. Not sure why you keep insisting this.
There is a backup method for modern electronic keyfobs (incuding Tesla cars) where you place it in a designated spot to start the car:
BMW: https://youtu.be/BttKQ6K-Y74?t=70
Lexus: https://youtu.be/9S8fm8UE9T8?t=57
Nissan: https://youtu.be/lV_HLwlOS-8?t=54
Audi: https://youtu.be/4gq4L9IQO7U?t=85
Tesla S/X: https://youtu.be/0J1VbeDfQmg?t=64
Tesla Model 3: https://www.youtube.com/watch?v=7xxCgtXEMVY
As you can see, it's not solely "wireless". In the Model 3 this is the default behavior. For both unlocking and starting if using the keycard.
If you can design a better system than the rest of the engineers in the auto industry combined, lets hear your idea.