I agree with your statement, but law school (in the US) gives you a literal doctorate. It's not a PhD but JD stands for juris doctor.

On the other hand, always targeting the lowest common denominator has negative consequences also. There needs to be a balance, and equity to close the gaps.

The solution to that isn't to dumb down everything, it's to lift everyone else up. Mandate that adults be educated and provide remedial classes at community colleges for free. Failure to comply results in losing the ability to hold gainful employment or vote. Anonymize testing and tie test results to social security numbers.

It's either do that, or allow civilization to collapse while other countries that do force their citizens to be educated flourish.