"If attitudes towards wasting money on "Interstates in desert regions" existed in the 1950s, much of the current Interstate system in the western US would still be two lane US-xx highway
The environmentalism and anti-tax sentiments that started in the 1970's, working in concert with each other (though both sides are loathe to admit it), served a beneficial purpose. Those two widely-reviled philosophies forced planners to consider limits (economic, environmental, and cultural) to available resources in their planning.
This is why even in Texas, you are seeing considerable resistance to big footprints for transporation corridors (i.e. the newly-killed off Trans-Texas Corridor). Right now, the only new Interstate that has new terrain factored into planning is the extension of I-69, and that's a dead project walking. In fact, the one thing that's going to kill off I-69 before anything else is the developing lack of justification, on economic grounds, for the extension.
Be careful about making statements like "forward-thinking," as you don't know how forward-thinking has gone through great changes over time. Take it from this "Native Roadgeeking Son of the Great Plains:" Cost-Benefit Analysis is good for you, and for everyone.