Joe, I recall one of my landscape architecture professors saying that things don't go around in circles, they go around in an upward helix...sort of a circle, but you don't end up at the exact same place the next time around. And hopefully, it will be a bit higher.
In general and in golf, trying to use a human mind to solve a problem rarely involves just going back to the way it used to be. Golf courses kept getting more complicated in an effort to make them more perfect examples of ANGC ideal. I expect no less in the efforts to make courses meet the P2 ideal, if that becomes the ideal.
Besides, P2 is a high end course. As you say, if you really want the simple days of yore, drive to many courses in KS, NE, etc. where there was never any money to improve. You will still get that 60's golf experience of patchy brown fw, browner roughs (unless it rains) etc.
As to irrigation, I still advocate for a return to those days, they went to double row, and I still think that is the minimum to cover the fw well without over watering some areas too much. It sort of naturally keeps the middle green and the edges a fuzzy brown. The next thing is to pipe it for every other day watering, rather than be concerned that there will be a few days in August where you get some browning, rather than try to be able to match the driest days on record. Not sure when that idea fully took hold, but it sure drives up irrigation costs.