Camelot
Adventurer
I think the are searching for an replacement. They want a profitable way to milk the D&D brand and the classic RPG isn't (compared to the profit margin of their other venues).
They need to turn it easier, faster and much more beer and pretzels.
If I were a Hasbro bean counter I would name the need for an DM as one of the largest barriers to entry for new players and pressure them for ways to eliminate the DM role.
I won't be surprised if these "tougher encounters" will eventually be played by the players alone, directing the monsters through special "take a monster turn" rules without needing a DM at all.
It wouldn't make sense to advertise a "hardcore encounters" and then tell you, "but you have to control the monsters themselves."
Player:...Okay, the monster turns around and twiddles its thumbs. Anyone object?
Other players: Nope, sounds good. We win!
Wouldn't be a very good move.