It is static for long periods on time.
It is 'revised' when scores get too low.
Less educated.
Not their fault, it is the system.
Higher education enrollment has grown but so has population.
Please do not equate law with STEM.
Medicine has not typically attracted the 'brightest, but the driven.
Physics drew the 'brightest' on raw brain power.
Sorry but this is wrong on many count. Not just enrolment has increased, but the percentage of the population attending higher education has grown significantly. So has education level. However, absent intelligence increase, there is no reason not to expect SAT to go down.
That said, the SAT has, in the mind of many experts fundamentally changed, shifting almost more towards knowledge, easily obtained by simply studying, and less a test of raw underlying ability.
I never equated law with STEM. I recognized that Law is a career that traditionally attracted people of high intelligence.
Medicine has absolutely attracted, on average, the brightest. Perhaps not the Einsteins, but on average highly intelligent people near the top of any professions.
At the PhD level, Physics draws perhaps those with the highest abilities in many measures of intelligence. Of all those with Physics degrees? No.