> These are OS basics, these are foundational. Every app has them, and they are always in the same place. They shouldn’t look different! This is the key point

> These are OS basics, these are foundational. Every app has them, and they are always in the same place. They shouldn’t look different! This is the key point for me. I think I go further than the OP, though; I would almost force apps to use the stock menu items. Declare that your app has to save stuff, and the OS can take care of supplying a 'File -> Save' menu item, a Save toolbar icon, and a Save keyboard shortcut. I guess the more 'liberal' way of doing this would be to make it so easy to do the above that you would really have to go very far out of your way to purposefully deliver a worse experience. But you're free to do that if you're so inclined.