Geologist by training here and it's been many years but as I recall, subsurface geothermal systems can be quite complex, especially in regional systems like Yellowstone, Iceland, New Zealand etc.
The hope, as I understand it, revolving around geothermal in the United States is tapping into much larger areas, namely the basin and range region, where subsurface temperatures are much higher than other areas. In this area, while there are many natural hot springs, they are remote and less commercial so disruption would have less impact. The benifits could also be fantastic since there is a huge area that has potential. (Most of Nevada and Western Utah). The biggest challenge is the complexity of underground faulting throughout the region. We can understand the general structure (hence the name "Basin and Range"), but the details are a challenge. At each macro fault you have lots of microfaulting and if you are attempting to scale up an energy production facility over an area you risk disrupting the system with each fracked well.
If we can very accurately map the subsurface, it'll go a long way towards making this energy source much more viable. (We've had years to get better at microfracking so getting an accurate map of what's down there is most important)
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