Yeah, was just speaking with some folks recently about how to remedy that.... Anything that hasn't been changed since before 3.6 has a high likelihood of not working, so it might be good to mark as deprecated/unsupported/something. That would cover much of the cruft.
And, well, the support thing is an issue too. Lots of 3.4 era Quarks that will surely confound any newcomers with problems.... but, SC version compatibility is not really used, though it's sort of supported.