A lot of strong words are used like "important" or "Carry less by knowing more" and it can lead to one-upmanship and rules in place of advice. Like all things in life, I think a balance is advantageous.
To wish only to accomplish what our ancestors did with the tools they have is very worthy but I personally feel that I can accomplish more.
In my mind, a good knife has evolved from a shard of flint; both cut well and can be things of beauty. Therm-a-rests have evolved out of reindeer hides...
These comparisons work well out of context because I take what I like from the past I enjoy. If I lived in New Zealand and wished to sleep out in the cold at some point in the distant past, I wouldn't have access to reindeer. I would have to spend an hour or so collecting grass to insulate my bed... That doesn't sound so appealing as a nice furry reindeer hide, so I go with the reindeer.
If I wanted a good cutting tool 2000 BC and there was no flint, Id have to trade, steal or improvise and a good cutting tool is hard to improvise
Stealing would have probably involved killing or being killed and that leaves trade
so instead, Ill just buy a knife now.
If I'm by a beach and I want a shelter, I could try to bag a seal or attempt to make a canopy of kelp using a driftwood frame... or more than likely, I'd just try and find a cave to make my own. I do have a preference for a nice tarp though. I also happen to like canvas, not because it's "traditional" but because its harder to set fire to
I like to be in nature so for me, I take what I can from the new and the old but always whilst trying not to exclude nature. My ultimate goal is not to aspire to be the same as our ancestors but to try new things, to explore and to investigate.
I commend anyone who has attained a level of skill where they can live for a time without the modern trappings but like the truly modern, I think having a polarised view can limit your enjoyment by restricting your choices.