When I want to improve one of my iOS apps, I shake my phone, type in a prompt, and off it goes to Shelley, together with a screenshot!
Iteration (culture) is eating planning (strategy) for lunch.
I'm finding that grinding down the friction, even as minimal as getting myself to the agent input, enables iteration.
Ideally, you could just customize the app from within itself, like Pliable does, but that would be against the app store rules.