The function of “Selling” is to distinctively make the prospect or customer know every hint of value in your solution. It is an understanding of the user, because what you make is ultimately for the benefit of those who use your product. If your product is made to assist the user, then only will you be selling each section of it.
Accessibility of value recognition takes the form of additional things built into the product itself.
Eg. Userpilot does this from outside but that’s a very basic example.