Ben,
To be fair, you've not seen the site, so perhaps suggesting better placement for the bunkering is a touch optimistic.
Bill and Ben (but not THAT Bill and Ben
),
Knowing the hole, basically what you have is a 410m (450y) par four that even for me into a bit of wind is driver + four wood or driver + hybrid. If I absolutely rip one with a little bit of wind assisting, I have a six iron in.
So effectively as I see it the proposed bunkering pattern takes into account that this hole will play as both a two-shotter and a three-shotter for different golfers on the same day, and for the same golfer on different days.
Played as a three shotter, when the golfer might only hit their drive 180m-200m, the short left-hand bunkers are in the range where you want to be, leaving a second to your preferred distance short right of the green.
Played as a two shotter for the golfer capable of hitting a longer drive, the bunker down the right is about 260m from the tee, guarding the ideal approach angle into the green.
For the average handicap amateur, both bunker locations guard what will be an ideal drive location on different days. It's quite a windy place for an inland course, so the placement of drives can vary greatly (as I said, I have had both 4 wood and 6i into that hole after flushed drives).