I realized that the formulas used in the search of ET civilizations will change as the rate of our own AI develops in how we use it to search for ET's and the broader implications of what we will find out there. When the nature of the actual rate of AI progress is better understood as we go so too is our expectation of where ET's will be, because they will have themselves developed AI at a similar rate.  Maybe a faster rate towards building General intelligence means the wider range of places there are to look out in space, less confined to safe life-friendly zones, and concentrated near interesting natural high energy phenomena like rotating black holes and high-velocity stars. The weird part about finding intelligent life is we will instantly learn about our own future.. we will learn more about ourselves.