Adoptable Storage has been in the industry since quite some time now, and it is a pretty helpful feature for lower-end devices with low internal storage space. Adoptable Storage was introduced with Android Marshmallow quite a while back, and it allowed users to use their MicroSD card as an expansion to their internal storage, i.e, one could install apps on the SD card too apart from using it for media storage.
Samsung didn’t allow adoptable storage on its devices stating that the feature would benefit only the lower end devices since the higher end ones usually have ample internal storage for apps. However, it seems like Samsung is all set to change its stand on the aforesaid feature. A post on XDA Developers (credits to GSMArena for linking the source) reveals that the Adoptable Storage feature will be available for the Note 9 and the Galaxy S9 series. The feature was found in the leaked S9 firmware, but it doesn’t work properly as of now according to the post.
While the inclusion of Adoptable Storage in Samsung’s flagships doesn’t make any sense as such, given the fact that very few users will hardly need extra storage on top of the provided internal storage, what’s notable is that it might pave the way for other lower-end devices to get the feature as well, and that’ll be pretty beneficial for the users.