So the downside now is you have to be available for the whole week, which means you can't commit to other clients that week and you can't take time off? And you've got similar disadvantages with hourly billing where if you get through the work faster you'll have less work to charge for later and there's a cap on how much you can earn because there's only so many hours in the week?

Not saying other approaches are perfect but I'm trying to understand alternatives.