As discussed on the community group's call today, accessibilitySummary has a number of shortcomings at the moment, from being language-specific to not being clear what to put in it to it not always being needed unless there are other details that can't be expressed through other metadata.

We currently require this metadata be set for conformance, though, which forces people to put something into the field even if it's not useful.

The question is whether we should move this field to the recommended category so that it can be omitted if the publisher has nothing useful to add that the other metadata doesn't already communicate.

Making this change would not invalidate any existing content as it as a loosening of the current requirement.