I am still not understanding why my iPhone 13 landscape photos look as good as those from my $900 Nikkor Z 24mm f/1.8 S prime lens with its superior optics on a $2k DSLR body. If the reason is fancy post-processing, then why can't Nikon have a tiny lens like the iPhone 13 and just add fancy post-processing to it?
What people often mean by similar statements is they like default phone processing compared to 0 in the camera, and there is enough detail due to tons of light and due to landscapes being generally easiest scene to shoot.
As for why they are not comparable, also a very strange question from seemingly experienced photo shooter - compare software development department and budget in Apple vs Nikon, who is a tiny player we all love (have D750 since it came out and carried it everywhere up to 6000m), they use very specialized CPUs which are very good for 1 thing only (basic operations on raw sensor data and potential jpeg transformation), and various ML and stacking transformations aren't simply available there at performance required. The whole construction of camera and processing hardware isn't around snapping 30 pics and combining them together under 1s, pre-taking pictures before actually hitting shutter etc.