i've been developping for 20 years, and 10 years on iOS as a freelance. I've seen all the horrors, and i can now safely claim that all the problems i've seen o

i've been developping for 20 years, and 10 years on iOS as a freelance. I've seen all the horrors, and i can now safely claim that all the problems i've seen on iOS development come from not designing the model layer properly in their MVC app. Because most developers start by coding UIs and later end up wondering where to put that business logic and make it reusable. And now every time i see another pattern that claim to facilitate refreshing the UI upon model change ( and vice versa), i know it's going to be a failure.