The habitable zone theory is an ok one but 3 planets (including the binary) isn't a very big sample and if pilots only look in the specified range it'll be self-fulfilling.
yes that's true, and if there is credibility to the theory, it's unlikely that we'd find the bounding temperatures first. By all means, search wherever you want; I just can't bring myself to search randomly without some sense of logical direction. It considerably reduces the number of planets I feel I need to search, from dozens to just a few, in any given nebula. So far, I've also been searching planets that are a few kelvin hotter or colder than 194-379.
Something else I've been pondering... since there are [relatively] so many barnacles in Pleiades Sector JC-U B3-2, which is 379K (compared to the other 2 planets, which are both colder), maybe 379K is closer to the optimal temperature, rather than a bounding one.
Of course, how anything can survive in the vacuum of an airless world, regardless of temperature, is also intriguing.
There is one particular planet in Coalsack that I WILL be checking again thoroughly, once FD confirms they have fixed the spawn bug. It just seems too perfect and too similar to Pleiades Sector JC-U B3-2 1.