Well said Intruder!
Just as an example ..
Blast Off into the murk and Mr. Radar resigns...Your destination has forecast CBs..."OK what do we do now?"
"MEL doesn't apply so we're good to continue." would not be my go-to-decision.
In Offshore Helicopter World ...if the destination is IFR ..the approach requires a WX Radar so you are not going to press on.