It's not narrow-minded. It's correct minded. Apple has created an ecosystem for the type of uses you need. An iPhone is not meant nor has it ever been marketed to replace desktop/laptops.That's just narrow-minded. Phones are anything but phones today. They are handheld computers. There are already companies trying to make them more versatile (Samsung DeX, Ready For by Motorola, Microsoft tried Continuum, etc.).
Laptops don't have a higher standard than phones. Many phones are better than many laptops. Plus, a phone can do so much more. It's easier to replace a laptop with a phone than the other way around. A laptop has a bad camera, doesn't fit in the pocket, can't make calls, etc.
Of course, there are those who need a really high-performance computers or prefer something else. This doesn't mean that for a large majority, a phone would be all they need. They could give up both traditional computer, camera, etc.
I absolutely believe that this is the future. Just comical to read how many don't already see the potential in it. You don't have to get rid of anything and the transition for even simple users can take time (or it goes faster than you think).
Just because X is better than Y doesn't mean X should do Y. Again, each product is a tool and you are asking to use the in correct tool.
The potential you see is already being enabled thru the iPad which offers close to desktop/laptop experience.