The problem is simply that the "differentiated experiences" end up being bad. Bad UX, bad integration in the platform, bad functionality, often gratuitiously du

The problem is simply that the "differentiated experiences" end up being bad. Bad UX, bad integration in the platform, bad functionality, often gratuitiously duplicating existing features. If the manufacturer/carrier additions were actually good, people probably would be happy. So the problem is boils down to Samsung/Nokia/... not realizing that they are not very good at building mobile phone software. That's probably also a hard sell internally.