David,
The par three 2nd at Somerset might be a better example because most every golfer, if playing from the appropriate tees for their skill level, is trying to reach the green with their tee shot. Drivable par fours are a different story as the reality is most players can’t reach them in one shot even if playing the appropriate tees. They end up just being short par fours. What makes the 10th hole at Riviera great is the temptation and options it presents to players who have the ability to go for the green off the tee. Otherwise it is mostly just a very good short par four (as you described it) with a very difficult approach shot.
There we go. NOW we're on the same page. Makes sense now. :-)