Because why anyone have to carry more than one if you cross market segments.

Personally, I want a good user experience, lots of business apps and productivity apps, a few games, and great media capabilities. Oh, and i need a piece of hardware powerful enough to handle all of that. Should hardware vendor X build a feature phone that meets my needs or should i be able to find a piece of hardware from Vendor X with an good OS that I can then either customize myself, or have it preconfigured to meet my needs?

Honestly, what makes more sense?