Threat management will be in regardless, but it can be spun around in a way where the player doesn't need to hold back their dps but instead manage another resource to control that threat.
Example:
Monk is given 5 resources every minute called "Numb" - reduced threat from the next ability to 0.
Generally, they would want to utilize this with their heavy hit in a rotation. It would also be more beneficial to use it for all abilities in a string of attacks that line up with increased damage cooldowns going off.
Either way, when to use those resources drastically depends on the situation at play making it a much more dynamic system. It's far more engaging then simply determining your threat output over time and holding back to manage it.