[adrianmsmith]

That's true, but I think different people have different needs and preferences.

Many companies give developers laptops (even though workstations would be faster) so evidently some people already trade portability for power, so having your phone be your main computer would just be a further step in that direction.

For people who aren't developers, e.g. managers doing email, browsing, Excel etc., I'm sure a phone would be powerful enough.