Require all workflows using matrix strategy

Perhaps this is more of a feature request, but is there any better way of requiring all status checks, especially when using a matrix strategy? A repo may already have a large number of combinations of platforms, tools versions, etc., but adding new combinations won’t automatically be required.

I’ve added a sink job like I’ve seen a lot of other repos do, but it might be better, if no workflows are set as required, that all workflows are treated as required. It could even be enabled behind a setting to avoid breaking changes.