[texxtxxet]

most camera buyers will in fact never buy a second lens [...] you've just wasted your money on a body that doesn't perform as well as an iPhone because of the cheap kit lens

Probably the strongest argument here. Yes, there are clip-on telephoto lenses for phones; but nothing beats a big piece of quality glass for speciality photography. Even in the low end (e.g. Canon RF 100-400mm F5.6-8 IS USM) this will be much more versatile for specialty photography.

Unless you're a pro photog you probably don't care, so want to take photos of your dog? use your phone is also good advice.