Elon Musk is doubling down on his promise that Tesla robotaxis in Austin will be entirely driverless by the end of the year. During an event for his artificial intelligence company xAI, the Tesla Inc.

You’re at the baseball field. You just dropped your kid off. Midway through a peaceful walk to the bleachers, your phone buzzes: “A door on your Tesla Model X is open.” No problem, you think. Open the ...