That a stupid argument, and one that misses the point completely. If you want or need to take a photo, your massive camera setup sitting at home does you no good. The camera sitting in your pocket anyways, however, does.
Lots more where it is feasible. :) But sure, if you can’t use a big camera, or don’t want to, use your phone. It’s no skin off my back. Just wanted to point out that “phone” vs. “no camera at all because your big one is at home” is a false dichotomy.