If you don't have declarative rendering, you have imperative rendering with stuff like `canvas.drawLine()` etc. (just a made up example). This code tends to be

If you don't have declarative rendering, you have imperative rendering with stuff like `canvas.drawLine()` etc. (just a made up example). This code tends to be very annoying to write and maintain because you need to do a lot of building up of elements and tracking the state of them yourself. What you are referring to with UIKit, NSLayout, and Storyboards is in fact declarative rendering, but the layout code can only be modified with a point and click editor. In most people's opinions, editing code directly is much more controllable and works better for systems like Git.