I was using info from ✏ A little guide to... using SD cards
Android controls where newly installed apps are stored. After installation, many (but not all) apps can be moved from the internal storage to the SD card and vice versa by the user.
Meaning that apps can only be moved after installation, i.e. at the users discretion hence no problem moving them back. Though not stated the OS may present an option at installation, again, meaning the user has full knowledge of where the app is.
Basically my argument is that the user shouldn’t worry about whether an app may or may not be transferred back the the internal memory as the use would have selected which apps are on the SD card.
The caveat is that what I read in the SD Guide is correct. Do you think it may be wrong and could do with editing?
However reading the concern again
It is worded in such a way that the move to the SD card was known and therefore my comment about what is and is not stored on the SD card may be spurious.
Apologies if that is the case.