Shipping value is important. If you can build a solution faster in a monolithic, MVC style framework running on EC2 instances, then do that. I think people get too bogged down in the minutiae up front and forget they are being paid to solve a problem ASAP. Worry about optimisations and improvements when its going to add more value than right up front when the burning need of the business is to have something - ANYTHING - up and running and helping generate revenue.