Tim,
I think its really a deeper question than some of the responses here.
I have always felt that as life gets generally easier that our recreation would naturally get easier, too. Also, in 1500, they didn't know if the crops would come in and they couldn't predict the weather, as two examples. Now that society can predict things in advance in so many other fields, its seems natural to me to want to want more predictable golf, too. It is just part of societies expectations more than when golf started.
I do agree with the fairness doctrine, and agree it probably accelerated over time, as money on the PGA Tour got really big, and as TV spread whatever word the pros said about design. I understand the notion put forward by JN that the golf course shouldn't hurt the player....playing for millions of $$$.
But, we do have to recall that it has been a long slow trend, evidenced by most of the Golden Age writings, and probably before. The whole golf world, including everyone in charge didn't simply lose their minds one day in the 1980's. With 500+ years of golf architecture history, some features just got more popular than others, and as technology developed, and wealth grew, it was easier and easier to build what you thought was popular, so why not do it?
Just MHO, as always.