Designing a product line on a common framework, then building multiple models off of that framework is a way to take cost out of manufacturing and run a lean enterprise. You can turn a product into a simple commodity and can produce many thousands more cheaply.
So a commodity approach for manufacturing is good. On the other hand, a commodity approach for marketing is bad. If the consumer views your product as a commodity, then all you are doing is selling boxes. Your product is just the same as anybody else’s product, and the consumer buys on price alone.