Would DaD benefit from an offline mode?

As the title states, I think an offline mode that allows us to go in and practice bosses uninterrupted would be a beneficial change. It could also help the new player onboarding experience by allowing them to practice normal mobs and learn the modules. I don't think it should be a straight PvE version of the game, just an option that allows you to go in without worries. There wouldn't be any rewards and all loot you find in raid doesn't leave with you. You also wouldn't lose gear you brought in upon death. What do you all think? Is it even feasible? Does it take too much away from the devs intentions with the game?