Jerry,
I do see a trend to Zoysia fairways, in part because the lie is like "teeing it up". Average golfers hate the tightly mown fairways, and good players can spin it either tight of propped up on Zoysia. I do recall Butler National got a lot easier when they went to the tighter bent grass fw from the original blue, where the ball sat down just far enough to reduce spin, and the greens were mostly set across the line of play.
For most courses with traditional fw/rough separation, tight fairways do allow shorter, more playable rough, if you have blue to blue or bermuda to bermuda (and no color contrast to differentiate the two) Zoysia to bermuda (or bent to blue) gives you that contrast w/o having to raise mowing heights.