I'm going to toss out another tidbit.
I don't think USSC Justices should be constrained to be lawyers.
Many of the cases are fine points and dwell on legal minutiae, but in general the influence of lawyers on American society is way overdone and needs to be undone. This is a result of numbers more than anything else. No need to add some sort of legitimization to it by insisting that Justices be lawyers.
A non lawyer can interpret the Constitution and essentially ignore stare decisis. It is not clear there is anything wrong with this. It would also save money on law clerk budget.
The Constitution was written by --lawyers. Thirty-five of the Founders (out of 55) were ---lawyers or had studied law.