Everyone can write- or can they?
The purpose of writing is to communicate from one person to another. If writing does not convey the intended message; it could be argued it fails to be real writing.
Most people write every day - text messages on the phone, emails, and notes to friends, colleagues, family or others. Some of us write more, and some less; but there are few people who don't use writing to communicate -or at least to attempt communication.