Wrong. It turns out that even after "adopting" a microSD card as internal storage, there are still several issues:
- Not all apps could be moved to the SD card, so you'll end up managing storage manually anyway!
- Google Play Movies refuses to download video (yes, purchased videos) into the now adopted "internal storage." So you end up losing functionality!
- The conversion slows down all apps, not just the apps that move to the SD card. I have no idea why this is, but my guess is that swap, etc gets moved to the SD card. (I was using a UHS-1 card, so my card wasn't the bottleneck, though conceivably, microSD card readers in relatively cheap Android phones might simply not be that fast!)