They could probably even add lane assist to the 6x0 line of Nuvi's. They simply choose not too. They could nickel and dime us for software/firmware updates, but they choose not to I want a Power User Nuvi that is fully customizable. I bet it would sell like hotcakes.
From what I recall the closest they had to a power user Nuvi was the 7200. However, Garmin set it up to fail, had no battery and a 5 inch screen that priced it out of most users range.
From what I recall the 7200 had most of the customization features from the 26xx and 27xx series.
For got where I read it but Garmin had stated the limitations to end user customization was because they did not want to have a product that would overly confuse the end user.