Just a few things as we seemed to have strayed off the topic of whether the science has stalled.
I believe the whole left brain/right brain thing has been shown to be mostly incorrect (sort of like that "we only use 10% of our brain capacity trope").
Accepting your premise that sasquatches were hunted by man and have thus learned to hide from man; Why then are the majority of reports found civilization-adjacent? Why does sasquatch seem to have a propensity for walking near roads, hiking trails, campgrounds (as per geotherm in this thread). I see not internal logic in sasquatch reports, does it avoid man but not understand what a campsite is, or a road, or vehicles? This inconsistency is yet another reason I feel this is a cultural phenomenon rather than a physical animal.
Gorilla, in the vast majority, have consistent behavior within it's species, as does every other physical animal. Why doesn't sasquatch, if it's flesh and blood. (no woo please. this is a science thread).
Now, this is a great science question that needs an answer along with many others before sasquatch science is unstalled. We don't have these answers and we can only suppose or theorize.
1. What comes to mind is some bigfoots need easy prey such as chickens, cows, or dogs in order to survive.
2. Some bigfoots such as juveniles or out casts have been pushed out of remote habitats by more dominant clans.
3. Bigfoots can't avoid roads and other human elements in order to keep up their migration pattern. This leads to question 3. a. Does bigfoot migrate?
It becomes obvious we have more questions than answers.
One documentary on TV showed a credentialed biologist studying Snow Leopard in Asia, and he made a great blind. He spent months and months in the cold until he got great videos of the creature.
The highlighted question above has been discussed here in various threads going back several years.
Summarizing the hypothetical source of the conflict and resultant evolution of interspecies attitudes:
1. Bigfoot and hunter-gatherer/early agricultural humans competed for the best and most supportive terrain for food.
2. Early on, bigfoot would have had an advantage as small groups of each encountered each other during competition. Bigfoot had the advantage during confrontations.
3. As humans developed more effective hunting weapons and as human communities grew larger, humans were more effective during confrontations.
4. Bigfoot, in response grew more stealthy in order to take advantage of shared food sources without being driven off, and more active at night.
5. Over the centuries/millennia, there were times, climatically that made survival more difficult, so humans became more efficient at gathering large amounts of food available, processing it, and storing it for long winters, etc.
6. Bigfoot, faced with efficient human collection of prime food sources, were subsequently drawn to human livestock, food stores, and eventually human crops, particularly during harsh winters. They may even have preyed on humans at times.
7. Humans would have responded by attempting to hunt down and drive off bigfoot clans because preservation of their food stores equaled survival. The oral tradition of Jack the Giant Killer stories probably had their genesis in these times.
8. As a result, bigfoot became progressively more stealthy, and likely more judicious in how often and how much they took advantage of human food sources, finding the human toleration level, at which humans did not bother to pursue bigfoot to drive them off.
9. Bigfoot were likely a known and acknowledged species among the Celtic cultures (much as they are by Native American tribes today), but belief in such things was discouraged as a new and dominant culture moved into Europe. Anything humanoid would have been viewed as demonic in origin because it was a perversion of man's aspect and because man was believed to be made in a certain image. Generation by generation, as the nexus of human culture gravitated toward progressively larger cities, the view that wild men were myth began to dominate, and still does today. Consider also that many place names with an oral tradition of Wildman encounters include the term devil or something similar in their names.
So the history and interspecies evolution is more a result of competition for food than a matter of active conflict. Bigfoot are still drawn to us because we are an easy source of foodstuffs, but do so with as much stealth as possible to avoid confrontation.