Highlands Links (S. THompson) at Cape Breton, Nova Scotia installed fairway irrigation in 1996, in direct response to the opening of a lush, new, comprehensively irrigated Tom McBroom design at Bell Bay, just down the road.
Cape Breton GOLFERS will tell you conditions were much better at Highlands Links prior to fairway irrigation, and that there was very little, to no Poa on the golf course until the water was turned on. Now, Poa is king at HL.
The installation of fairway irrigation in this case was purely a matter of 'keeping up with the Jones'. It certainly didn't improve the course from a pure golfing perspective.