From a purely UI perspective that may be true (neglecting things like incompatible file systems, lack of networking outside large institutions, and the difficulty of doing simple things like sending email attachments), but that would be true irrespective of the adware. Text-based UIs are more efficient that GUIs, and mobile GUIs are a study of inefficiency.

On the other hand, it could take weeks to learn a nontrivial UI well enough to make it fast.