Problem
At the moment, Suggested edits are based on templates. However, some wikis has a low number of articles connected to stub templates, if not no templates at all (case of smaller wikis). Hence, newcomers can't find articles to edit.
Possible solution
The idea would be to stop using templates, and go with a query. During the Growth Ambassadors meeting, the idea came from this query:
pages that are in namespace 0 AND are not redirects AND are less than 1500 characters/bytes long
Configuration
Communities may be okay to keep templates, but some other might appreciate to have a simple, more automatic way to select stubs. In community configuration, the idea would be to select between templates (as exists) or query, and, for the query, to select the number of bytes (1500 could be the default).