The real issues with adoptive storage seems to be the fact that when you choose it, your sd card becomes more permanent. It is formatted to ext4 and encrypted. The read writes increase causing the card to wear prematurely and you cannot read it outside your phone so when it dies that's it, you must restore original system and start over. I hope we get root on MM, if not soon, then I'm going drastic and researching a rollback to Lollipop. At least in LP with Link2sd you can take out your card and copy it and read it. Maybe with root we can use Link2sd, but the dev is MIA, since July. It's a mess, now I understand why it is disabled. Even the LG V10 forum guys are slaying Adoptive storage saying it's only useful for low-end phones to augment limited system ram( eprom/rom), cause you chew up your cards and then your stuck.