Do you think living a "Tribal" lifestyle in 20,000bc would be less stressful than living in modern society?

about the same, some had it good and some bad

If there was a place 20 thousand years ago that had tribal society with a good climate and plenty of food, populations would have exploded and eventually there would have been a conflict for the resources. Humans, like other animals, struggle to survive and compete for resources and territory. It would have been less stressful in that society most of the time but life would have been much shorter and you would have probably been much shorter in any realist scenario where food was always plentiful.

HUMANS always have conflicts

even in a single family

the growth in good times would be a stressor, so would bad times,

20,000 BC the problem each morning was: will I eat? will I be eaten"

is this plant food or poison, OMG what was that noise in the bushes?

etc

that is why we invented religion and meditation

along with no rival tribe then yes