Assuming this is a pure design question and that irrigation is there, I offer the following (again)
I agree that 60 yards (40 yards with 10 yards of mowed rough either side (or 15/5) can be certainly enough) as long as its light rough for playability, except at tournament time. Even then, the spinners from light rough should be enough penalty.
To be honest, a play corridor of 70-80 yards is required for fun, hit it, find it, hit it again golf for average golfers.
For the strategery, it depends on the angle of the green, and how much the frontal hazards come out in front. Generally, longer holes require wider fw to open up the angle. I can design a green on any hole with just a few degrees of angle and then narrow up the fw, presuming hitting it within a yard of the fw edge is what you want to open up the preferred line of play on the second. However, if the green angles 20 degrees instead of 5 or ten, then the fw has to be wider.
Thus, we can make nearly any fw width work and maintenance considerations suggest narrower fw and greens more on line with play. Not that some variety wouldn't be great, but as we saw in the 30's and now, there is a great chance that alternate fw, wide fw, etc. will get reduced in the name of cost, so in most cases, it pays to be "efficient" and design for the narrowest fw possible that still offers strategic value.