1. Manual control over APKs file. User will directly access the apks from File manager.
If APKs are stored on external storage, User can access these apks for later use.
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Ex. I have set “Keep Cached App” to “forever” to save offline apks. For some apps i would like to cached but for some i didn’t want. With some desirable APKs some unnecessary APKs are also stored. Owing to this installation size of Fdroid app is more than 1.2GB. If APKs are stored on external storage then i would manually delete the unnecessary APKs.
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Ex. if this post creator had access to that apk file for later use then it would have saved his precious time and energy( Finding An Old PHP App)
2. Easier to Send apk to other devices(which doesn’t have internet connection and doesn’t have f-droid client, PC )
3. Apks will be separated from app data ()
And didn’t see the advantage of saving Apks in private directory except confining user like as “Play Store Trash”
BTW AuroraDroid Stored Apks in external storage.
Ref: Earlier posts: