So instead of simply buying a waterproof case or putting pens and paper under UV light for a few minutes they want high pressure water proof tablets which no doubt cost 200% more than the original item
Don't worry, it doesn't seem like those devices were modified at all.
My Xperia Z Ultra is already waterproof and both has capacitive touch and resistive touch, so I can write on it with a standard pen or pencil. The only thing they seem to have added is an extra case, which is probably unnecessary as well, my Z Ultra doesn't look like it, but it's basically indestructible.
and 5,000,000% more some UV lightbulbs and some pens and paper.
A pen and paper is nice, but you still need someone to enter that data into a database of some kind. Especially with Ebola, you don't want the notes to be left in a drawer somewhere in a foreign hospital waiting for someone to type up. Also with a tablet, you can annotate your notes with pictures and videos.
That being said, all of this is most likely a PR move from Sony. Undoubtedly, they gave those tablets to MSF for free. In exchange, MSF can say they're using it, which will be true initially, but in fact, most of those devices will be stolen, or will have disappeared, after a week or two. After all, it's not like these doctors from Medecins Sans Frontieres will be staying in five star hotels in Africa, they will have to go where the poor people are. And to a poor person in Africa, the value of an Xperia device is the equivalent of a couple years of wages.