If you have one of those devices that refuse to remount system r/w in Android such as the Nexus 6P, but you do want to do this, "echo FSTABSYSTEMRW=true>>/data/.supersu" in recovery root shell before a SuperSU ZIP flash will patch the boot image in such a way that remounting will work.
@Chainfire I've been following this as you probably have noticed but I probably missed this out isn't fully clear to me. Say systemless becomes fully stable, I would using TB to remove some stock gapps result in /system getting remounted as rw and subsequently cause OTA's to fail?
This was mentioned a few pages back, specifically for Nexis 6. Apparently Google's system image fills almost the entire partition so much that some apps see 0 bytes free. So Adaway can't modify the hosts file. It was suggested to remove some system apps for it function properly and modify the hosts file. Search the thread to be sure as I am sure that is how someone got it to work.
No as per my Signature - Samsung Galaxy Note 4 - And - No you don't have to wipe or clear anything.
It's "virtual", made possible by Chainfire's scripting.
Well, while it's very useful for root apps that are not yet updated, the old version was not detected by some root-unfriendly apps that check for the existence of that file.