I don't recommend pluggable functions unless there's no good way to unhook or unregister the functionality. This encourages others to bypass the core APIs to modify functionality. Plus, there's both backward and forward compatibility concerns.
For example, the digistarter_widgets_init() function is pluggable but doesn't need to be. Child theme devs can easily unhook this or unregister the sidebars (preferable).
I don't recommend pluggable functions unless there's no good way to unhook or unregister the functionality. This encourages others to bypass the core APIs to modify functionality. Plus, there's both backward and forward compatibility concerns.
For example, the
digistarter_widgets_init()function is pluggable but doesn't need to be. Child theme devs can easily unhook this or unregister the sidebars (preferable).