Brian Schneider, along with the club, allowed for considerable time to finish researching any and all past records for just how the original 17th existed. As Tom Doak alludes to, none of those documents had a historically precise count of the # of bunkers.
Did Brian add a flourish or two that might be construed as visual excess? Perhaps, yet the last version of the hole was a blighted anomaly relative to the other 17 holes and absolutely needed some measure of creative license. The berm and the tunnel was a restoration to the original.
I've been fortunate to personally witness the evolution of Brian's restoration and the coup d'grace of the new 17th fits in perfectly. Jon's picture, while brilliant and all-encompassing, may convey some cover for labeling it excess, yet in totality, it hardly feels that way.
The hole starts in the course's busiest locus point...the convergence of the 4th and 16th green, 5th and 17th tees...and ends at another...the teeing ground for 18 and 10. Expecting to play at 220yds, wayward shots there might have serious consequences.
In this case, the negative connotation associated with the word "excess," usually used around these parts just isn't deserved.