Full height cabinetry allows for easy concealment of brooms/mops/vacuum cleaner. Having the washer and dryer separated creates more benchspace in an already tight area. Perhaps framing the dryer with cabinetry would create a more streamlined look.
In contrast to popular belief, designers aren't looking to just spend as much of the customer's money as we can. Their designers allow you to communicate ideas and supply feedback until you're pleased with your possible space