Hopefully you carry your dSLR around with you everywhere you go then.
It's a matter of convenience. You can get similar results by manually cropping the pictures afterwards, but it's a royal PITA, and it makes framing harder when you take the picture. Plus, the results for cropped zooms can be quite decent if there is sufficient light. To me, having a 48 MP telephoto with a 7X or 8X cropped zoom would be a major win. In fact, I specifically did not buy the 16 Pro Max to replace my 12 Pro Max, because I was waiting for this new 48 MP telephoto sensor in the 17 Pro Max, with crop zoom. I am personally not expecting a true zoom with moving lenses, but we shall see next week.