In Golf Architecture in America the Captain writes:
For a spoon shot or cleek, or a long iron to a green which is, roughly, from one hundred and eighty to two hundred yards, the minimum of the green should be ninety feet in depth, by eighty feet in width; but, preferably, it should be one hundred and ten feet by ninety feet; and carrying traps, if used, should be thirty feet short of the green, in which event give thirty feet of fairway behind green.
That is consistent with many of his drawings which reflect fairway extended behind the green. He felt the timid player falling short of the green benefited from a simple pitch from a good fairway lie while the bolder player, going long was penalized by bunkers or rough. He writes: ...for a man who has fallen short of the green is thereby enabled easily to run his ball up to the pin, whereas the man who has made a bold stroke, possibly lighting on the green with his ball, and running over the green is given a more difficult lie after a finer effort. To offset this situation, it is advisable in many cases where there are long second shots to a green, to make a fairway beyond the green, so that the man who goes over has at least as good a chance to play as near the hole as the man who falls short after an indifferent stroke.
This theory breaks down where the Biarritz is fronted by chasm or in the case of Yale, the pond. Yet it seems to me the swale at Yale and relatively small back tier serve the same purpose as Thomas' fairway behind the green. The green is in essence a putt-back hole for the bold player, or perhaps the player with less confidence and/or talent who timidly plays by taking too much club to avoid the pond.
I would love to see a shot dispersion pattern from 100 or more golfers of varying skills. I would suspect the swale saw even more action in 1926 when few players had the ability to hit high long-irons that would hold the front tier. Arguably Yale has the anti-Biarritz with the forced carry as opposed to other versions featuring fairways to and through the swale. I can't help but wonder how Yale's version would play if the swale and back tier were maintained as fairway. Did Macdonald throw the golfer a bone by at least letting him putt back rather than pitch back?
Where did Your tee ball finish?. The swale for me.