PS4 Disc

[Ash_]

You can delete the game, redownload the trial client, and login and it will let you play without the disk.

This. The key thing is you need at least one of the expansions as a digital purchase. I have physical ARR, digital HW, physical SB (don't ask me why, wallet was drunk). Deleted the game, downloaded the 'trial' from PSN, waited a day for download because Aus internet, logged in and have been without a disc since.