User blog comment:Cristina7/Introducing Discussions, a New Platform For Engaging Your Community/@comment-24687156-20160909160429/@comment-18172179-20160909175659

It takes time... and a PC to turn a viewer into a contributor.

App users are not slightly interested in content-editing. The rate at which they become editors is almost non-existent. I know this from first hand experience. This might change when Discussions are fully implemented on desktop browsers. Might.

Even then

Discussions are designed as an improved mobile feature. Until it proves to be equal or better than Forums (designed especifically for desktop use) they should NOT be replacing one with the other.