>>- Want to write contacts? Here's reading too! Want to write texts? Here's reading too! Same as above really. Is the use-case of wanting an application to be able to add to my data (at my request) but never-ever read all my data really that hard to predict?
I've configured security for a large variety of systems and I've never heard of a write-only permission. Read-only is often seen as a lesser right than read-write.
I'm sure you've heard of the UNIX sticky bit, which is used so that anyone can write a new file to `/tmp`, but without being able to access other files in the same directory. I can certainly imagine the same implementation for contacts (create new contact, see only contacts you have created) and texts (create new text, see only texts you have created).
I've configured security for a large variety of systems and I've never heard of a write-only permission. Read-only is often seen as a lesser right than read-write.