As a Crew Resource Management program manager two words make me uncomfortable...scud run and sneak under.

Everybody is referencing the AIM. Might be a good idea to consult the advisory circular on Aeronautical Decision Making.

Many IFR rated pilots have fallen victim to CFIT as a result of a legal but questionable procedure.

Another scenario for IFR rated pilots to consider is canceling IFR and then having to go missed back into the layer/soup for whatever reason. Runway obstruction, high and fast, etc. Now you're IFR without a clearance.