Besides,...if you need such a precise altimeter, then you probably shouldn't be flying VFR.
That statement is utter tosh.
Just because you haven't seen or used one don't make such foolish remarks.
A rad alt has probably saved the lives of many pilots flying VFR.
If you nearly killed yourself going IIMC when scud running, the only cause is poor decision making on your part - s*** happens is an excuse used by people who can't admit they were wrong.