yes, disc is somewhat viable in rbgs, but otherwise it needs a very specific comp to function in areans or m+. If you love your priest like me, well, you still play it just to see how far you can go in keys, which might not be very far unless if you have a god ret player to heal for you like the worlds top disc priests have…
…But even then in these comps, a resto druid would still be stronger in DPS and healing output.