I'm a frequent traveler, and for all of these tasks my laptop is 100x better. Why would I want to do anything serious on my phone?

vs: large screen (so you can see more info, have more windows open to compare) keyboard/mouse interface instead of tapping (faster, doesn't take screen space) easy to save documents in a common folder which super-convenient tools for creating my own consistent file-names and directory structure auto-back-ups for compliance/filing.

The phone has only one advantage-- you usually have it with you.