I cannot add anything to the discussion that has not been already correctly said with the following exception:
1. While no one has effectively reported on the original in coastal France from which Macdonald drew his template (the topography has been largely obliterated by development anyway) I do sense for shreds of evidence that the absolute best copy of the hole comes to us on the 5th of Fisher's Island...though somewhat more stringent than the original which needed only an 80 yard hit to effectively carry the chasm and had somewhat more open ground to the left than the 5th F.I. or other copies. But the generality - I believe - is correct....endless Atlantic to the right, a knee knocking vista, and excessively strange target area that was camouflaged by its contours. Oh yes...and fairway, not green in the front "pad"
2. Despite the fact that fishers #5 and earlier maintenance practices generally kept the front pad as firm mounded fairway, I think the development of the front being green surface is apt to today's experience. Very few choose to play a punchy skipping shot of that length any more, especially when there's carry involved. And we must also acknowledge that to be an originalist for incorporation of design features or the ever-elusively defined "shot value"...a 200 to 225 yard shot was a little closer to a Driver for the better player then, than for the better player today. The average 15 HCP may still need driver to play a 225 tee, but the better player plays a more lofted spinning shot for that distance than when the original was observed. This is all to say that the Biarritzes' contemporary delight is that putt down and through the swale and up to the rear, or the pitch, chip or sand wedge across the swale from the sides. Or the frightening putt on the occasions when your result has finished beyond and above a rear pad location and you realize perdition awaits past the cup. The fun of the hole is more invested in having the whole complex be green now.
3. And if George Bahto is accurately quoted - he's absolutely correct - the pin must never be in the front pad if the entire complex is cut as green. The swale is then, not in the equation for sound, controlled play and 1/3rd of the hole is gone. You still have the carry and the vista, but the swale is only for misses and so removed as part of the hole's playing character.
4. I think the Biarritz is one of the most unique and fun hole styles, but more than that - my adoration for it as spectacle has helped me realize that in many ways it's the perfect half par hole (3.5) in the same way the Road Hole is a perfect half par hole of 4.5. and just as 3s are rare and precious on the Road Hole...2s are memorable on a Biarritz
cheers
vk