The use of Cocoa Touch is really an issue of what type of app you have. If it's a game you should probably look into other tools like Sprite Kit and Unity.
However, for most other apps, using Apple's array of tools allows you to quickly adapt to changes because Apple can change things quickly.
This may or may not make a difference to your app as the changes might be for something you don't use.
I would look at the goals of the app and see which tools are best for meeting those goals.