There certainly is a bit of confusion about using sd card as adoptable storage. If you mainly have media, I wouldn't use it.
It does help with app and app data which would automatically get installed on the sd card with adoptable storage enabled, but for most people, 32gb internal is enough. Now for those with 4gb or 8gb internal, I can see why you might want to use adoptable storage as it is pretty limited space for apps.
You can read more about it here
http://m.androidcentral.com/inside-m...ptable-storage