Why on earth would the NJ constitution forbid reducing judges salaries? Aside from the power of the government employee lobby and constituency, I mean. Or have I answered my own question?
A possible answer? Under a system of checks and balances, a judicial branch is supposed to be a check on both the legislative and executive branches.
It's hard for the judicial branch to be a check on the legislative branch if the legislative branch can reduce judicial salaries each time the legislative branch disagrees with a judicial opinion.