I, too, only found out about the lack of adoptable storage after ordering the Moto X4. Honestly, I never knew it was a thing until now. I did notice after updating to Oreo that the Podcast Addict app made me kick any podcasts (and their respective thumbnails) saved to the 64GB microsSD card back onto the internal drive. The message read something like “From KitKat forward adoptable storage not supported.” No big deal, since I have it programmed to delete after played, and to delete after 30 days, played or not.
I do think Motorola should be upfront about this, though. The specs on the Motorola website say this:
32 GB with microSD Card support (up to 2 TB)‡
BUT try to find the legend for ANY of these marks indicating further notes, on the RW or the Motorola site and it’s nowhere to be found. Am I missing something?
Anyway, after dumping any photos and music files onto the SD card, I still have 14GB free, which is about a dozen more than I had on the Moto X1 which is a ton of space for someone like me. Not a gamer, don’t have a need for lots of apps at this point.
It took me a couple years with the Moto X 1st gen to figure out I needed an app to clear cache and junk files, etc., which made a huge difference LOL. I use Droid Optimizer currently for this. Seems to work fine.