This is optional though, right? As in, nobody is forcing people to pay for groceries this way (hopefully)?
Those all sound like things I would never use either. Why do I need Apple or any other company as an additional intermediary between my bank or credit card issuer and the payee?
Honestly all this stuff both scares me and also feels extremely unnecessary and just another thing that can go wrong. I've never used any such digital wallet type thing - Apple's or any other company's.