Pat,
Your question rambles a bit, but in answer to your general question, I think most would be surprised at how little thought may have gone into any particular hole or difficulty. To start with, if we take the land as it is, there may be only so much we can do as gca to make a hole easier or harder. And if the land governs, then we might say "what the heck" to any particular rule such as easy opener, tough finisher, etc.
That said, as to par 5 finishers, some of us may be predisposed to that kind of swing hole for a finish and that thought may permeate through to the routing. And the stroke play mentality probably pervades the thinking because none of us working today remembers tournaments or daily play at match play, any more than we have experienced the stymie.
The par 5 finish, however may be influenced by something other than tournament results. As one owner told me early on, they buy more beer if they finish with a birdie. From that perspective, a short 5 makes a wonderful finishing hole, as does a short 4 or maybe any hole with a punchbowl green and funnel fairway.