Peter P:
You ask "why" do such a thing.
Here's a few answers ...
Plenty of people on this site bitch and moan incessantly about courses being sooooooooo long and being primarily one-dimensional in terms of their overall presentation.
Now, when someone suggests going against the grain you get the litany of the same people bitching and moaning that it can't be done. Given that attitude on this or anything else that falls outside the traditional box nothing can happen that really is different.
Let's consider a few practical items. Why must ALL that land be eaten up so that the marketing gurus can proudly proclaim that "X" course is 7,400 yards+?
Why must people automatically have a slavish tendency for a par-72 course. Where did that number become the be-all / end-all for courses? What's so wrong with a par-69 course. One of the very best courses in the country -- Wannamoisett in Rumford, RI, is a par-69 by Donald Ross and it works extremely well.
Until the urge to expand its length for national championship consideration -- the history of such places like Merion worked very well and the layout there barely hit 6,500 yards.
Pete Dye first introduced Harbour Town and the starting yardage for that layout when it opened was roughly around 6,600 yards.
Plenty of courses Tom Doak highlighted in "Confidential Guide" which are located in the UK and Ireland are layouts less than 6,500 yards and often times are not traditional par-72 courses (e.g. 10 par-4 holes with four par-5 and four par-3 holes).
That doesn't mean to say that such courses can't be challenging.
Gents:
I can't say for certain because I'm not on the inside of such meetings -- but I have to wonder how hard architects really push clients when it comes time to build golf courses? Or do architects simply nod when told by the prospective client and build what the ignorant guy / company want and leave it at that because $$ is on the line and they don't want to lose a job so they'll just about do anything the client wishes -- e.g. silly island greens, waterfalls, and assorted other BS items.
It would be very interesting to start another thread with the premise that architects can shape the future of the game
by explaining in more detail and possibly with a bit more resolve -- that today's golf game model needs to go in a slightly different direction -- one that will save land costs and the other which will attract more players without dumbing down the essence of the challenge for the extreme low handicap types. I have no desire to play the 60's version of "executive golf" which was nothing more than expanded par-3 holes that was really a dud.
I've played more than my share of "short" courses in the UK where you might have only one or two par-5 holes but the interplay of the rest of the holes is far more challenging than one can imagine. Throwing a few long par-3's into the mix keeps the low-handicap types in check and if you can insert a few really vexing short par-4's you can get challenges across the board. That would still leave enough room for a few long par-4 holes.
By the way -- why hasn't an architect designed a short par-3 -- max of 100 yards -- with two distinct greens -- no more than 2,500 square feet and make the players really sweat should they miss the target. Alternating the greens would keep the turf condition up to snuff. Unfortunately the American model is akin to the "super size" mentality you get when you enter the doors of any fast food restaurant -- just make everything L-A-R-G-E-R -- BUT not better.
Doak's creation of Pac Dunes played well against a "standard" type layout like Bandon Dunes. In fact, one can easily argue the point that until Pac Dunes arrived on the scene -- the entire BRANDING experience of Bandon Dunes was rather conventional in what it did provide. Pac Dunes (all 6,600 yards from the tips) changed that dynamic.
The real question is not "why" do such things -- but "why are we still waiting" for someone with a bit of nerve to break against type and do it.
Mark Fine is 10000% correct -- 6,500 yards is more than enough game for most and with the person designing such a layout can still prove to be a worthy challenge for nearly all handicap types.