Hi pineteam,
Like a cabin could prevent a pilot to crash an aircraft. This was one the dumbest aviation rule of 2016, hands down.
SOPs are often written to prevent the re-occurrence of an avoidable accident/ incident and over time the original reason is forgotten and the SOP appears "dumb" to some.
This weather radar discussion appears "dumb" to those aces who never make mistakes, and so believe they will always remember to turn the system on before they need it. They usually end up mitigating the threat rather than avoiding it in the first place.