No, because insightful isn't relative to a person's innate aesthetic preferences, but rather it's relative to the cognitive models they use to understand the world.
In the same way that one mathematical object can objectively be larger than another mathematical object, one mental object can be objectively insightful in relation to another mental object.
The difference is that there's a physical reality to size. Insight is subjective by default. Even if you make a standard for monitoring it, your standard is going to be subjective.
In the same way that one mathematical object can objectively be larger than another mathematical object, one mental object can be objectively insightful in relation to another mental object.