For studio photography, the lighting is more important than the camera. I once brought a pro-grade DLSR, a $400 entry-level DSLR, and a final-gen film SLR to the same shoot, and created images with all three using the same lighting setup. The difference in results wasn't immediately obvious.
Modern camera phones have good sensors, so if you drop one into an otherwise-professional studio setup, you'll get good results.
cf. https://www.diyphotography.net/samsung-used-my-dslr-photo-to...
You think? I'm amazed by the photos I get on my phone (Pixel) and that my wife takes with her iPhone. The low light performance is especially shocking.
I used to have an SLR and sometimes I think about getting a Leica just because they are beautiful, but if I'm honest my phone is a better camera than I really need.
So I appreciate the quality of mobile phone photography in such a small form factor
SLRs have enormous sensors. The largest common sensor size in computer vision is 1". That's smaller than micro 4/3. APS-C and full frame are huge. Big sensor means more photons, which means less noisy images. Combine that with a big ol' lens and a good processor and you get nice well-exposed images without any effort.
People are disappointed by phone images because they take snaps indoors or in low light, and their pictures come out grainy and noisy. In the iPad Pro advert the scenes are lit so brightly that the sensitivity of the sensor is basically meaningless.