Every educator needs to make a decision about technology they need to put in place. They're not sure if they should put Option A in place or Option B in place. This can be particularly difficult in the world of disabilities because there might not always be a perfect answer. Teachers can look to this solution, using the least dangerous assumption to make good decisions about what technology might be best.
Everybody tells stories, and that includes people who use communication systems. To ensure success and the ability to participate we need to make it as easy as possible. So that we can tell stories whenever we want, wherever we want, to whomever we want, and in a really easy way, so we can be successful.
When you don't have enough evidence about a student's performance, assume they can do whatever you're asking them to do.