I completely agree with Chris on this, changing the tab bar of an application should happen almost never. But I would go even further and advocate that developer’s allow users to edit the contents of their app’s tab bar. That used to be far more common than it is today — at least in my experience — and I think the trend is bad for users. Not everyone uses an app in exactly the same way and users should be empowered to customize the interface to reflect their usage habits.
➝ Source: chrishannah.me