It helps with the "wash in the morning" strategy. Right now I manually wash big pans because they don't fit in the dishwasher when there are also dishes. But I need those pans tomorrow morning as well. If the dishwasher finishes before I need to go to sleep then I can just put those pans in the dishwasher.

The "wash in the afternoon" strategy also becomes more viable. That way I don't have to turn on the dishwasher before 13.00 in order to have it finish before people start cooking. Relatives often visit unannounced, or maybe they change their minds around 16.00 and decide to join for dinner anyway, so I can't always plan for this.

A fast dishesher lets me "batch dishes" (maximize efficiency, save resources) without worry.

Cooking with the dishwasher running is a huge pain. Most of the utensils and chopping boards are in the dishwasher right when you need them for preparing a meal. And when you're done eating, the dishwasher still isn't done so your kitchen and dinner table are left dirty for an hour or two.