It's all about getting better utilisation of a Simulator. How much time do we spend briefing and setting up in the Sim before we actually get going? All of that will now be done in a classroom and when we get into the Sim we go straight into doing what we need to do.
The new courses actually, in many cases, have more Sim time allocated despite the sessions being reduced to 3 hours. Also no break in the 3 hour session so no wasting precious Simulator time in the coffee room.
Let's try it and see how it works before we criticise.