Jason:
Perhaps I need work on my semantics; I had always assumed that par 4s described as "driveable" had other options on how to play them --otherwise they'd be called par 3s.
Just because I described a hole as "driveable," and that the course designers intended it to be driveable, doesn't necessarily mean that that's the only way to play it, or even the preferred way to play it.
Where did I get the impression the 15th was intended to be driveable? Oh, I don't know -- the people running the course, and astute GCA contributors who have played it:
-- This from the Erin Hills website:
http://www.erinhills.com/erin_hills_golf_hole_by_hole_2.aspx ("The 15th presents the player several options – to lay up short of all the bunkers, to place the tee shot in the middle of the bunkers or to have a go at the green itself.")
-- One of the earliest course reviews of EH on GCA, from Dan Moore in 2007, who has probably studied EH more than anyone on the board:
http://golfclubatlas.com/forum/index.php/topic,29760.0/ ("Hole #15 338 yd par 4 (Green) With a centerline bunker prominently in play this is the most strategic hole on the course. Does the big banger go for the green or lay back for a wedge.")
-- From Paul Richards' review in 2007:
http://www.golfclubatlas.com/forum/index.php/topic,29130.0.html (#15 – (345) This is reminiscent of #14 at Bandon Trails or #17 at Crystal Downs or a handful of other holes that Bradley Klein once described as “drive-able par fours that are un-hittable in two shots.”)
-- Dan Moore again, in 2009, after significant changes in the course:
http://golfclubatlas.com/forum/index.php/topic,40451.0/ ("One can imagine this hole being played as a driveable par 4 on the back nine on Sunday. Bunkers on the left have been expanded in size with several new bunkers also added. The green was modified with a large ridge in the center of the green being softened. Still a difficult green.")
-- Jack Senior went for the green in his semi-final match against Kraft at 15 at the 2011 US Am; I was actually there to see that one.
I think going for that green off the tee is nuts, and indicated as such the first time I'd seen the course:
http://www.golfclubatlas.com/forum/index.php/topic,45966.0.html But just because I don't think it's wise to play that hole as "driveable" doesn't mean others should share that view, or that it wasn't one way the designers envisioned that hole being played.