If you're still working with an electronics design and assembly service that treats designs as "fire and forget," you're missing out on many of the biggest advantages to modern electronics design partners. The top electronics partners today do far more than simply churn out products based on schematics.
Sure, a decade or two ago it was good enough to fire off designs to a manufacturer in China and wait for them to start shipping product. Today, with the market so competitive, you need every possible edge to make a product that's popular and profitable.
The best electronics design services now have a dedicated future focus to their work, looking to save you money throughout the product's life cycle while improving its overall reliability. They can pre-plan for many contingencies, as well as preparing you for challenges to come.