At the risk of becoming a broken record, the game was even harder at the time of the course opening! Imagine carrying a bag of 8 - 10 c.1925 clubs, the most lofted of which was a niblick - at around 52*, with a thin sole. With these clubs, and a ball of that period, which allowed little spin, shots like those into 12, 15, 17 and other greens must have been very hard. I suspect MacKenzie and Jones built the odd hole which looked easy enough but played darn difficult - and that they were happy to do that.
MM