That would mean that you couldn't be a good songwriter for quite some time, even if you were writing fantastic songs, because there is no way of deciding if they dated. And what sort of timeline?
Like 'Get knocked down' by chumbawumba? Or 'Boom boom boom' by the outhere brothers?
So someone like kate bush would be a terrible songwriter as not many of her songs have been covered. Or Peter Gabriel / Phil Collins etc.
OK, so Mustang sally would be good songwriting, but Sledgehammer would be bad?
I don't know, it all seems subjective to me.