An isolated group is forced to find novel solutions because they don't have a body of evidence to lean back on.
In comparison, if you have an existing, known solution to a problem it usually makes sense to just use that.
It might be sub-optimal, but the odds you develop something better are low. So it benefits you to use the established method.
But the group at large would benefit more from having lots of people try novel things, because otherwise innovation stagnates as the "known" solution takes precedence everywhere.