Sure everyone's got heroes and times they romance about between the pages. Times are very different now. Sure the commercial knife industry as far as I can tell goes back (at least recorded) 5,500 years ago B.C., probably a heck of a lot older than that to be fair, from what I've seen historical specimen-wise. Not trying to downplay the names above contribution of getting the civilized outdoors, but it's easily arguable that all their advice is still scientifically or ecologically sound today. Who doesn't enjoy walking the PCT or the JMT and feel for a moment when all the euro tourists have moved on what it was like for those guys back when. Muir carried a pretty minimal pack, but had a beloved pocket knife to carve things when he had spare time. Fast forward to today, and (Pinnah - I've seen and appreciated your early posts about camping LNT in another thread) if even half of the nearly 4 million people who visit there get the same idea, thousands of years of irreparable damage can be done to the forest floor.
This is my greatest concern, it's not the inefficient novelty knives that are being produced for market share, but it's this niche culture of going back to primitive, frontier, simpler times that's potentially dangerous for the ecology we love as in none of those earlier texts does it site substantiated environmental impacts. It's fun skills to learn, to cherish and pass on, but I'm not sure promoting a knife to go cut all the wood in sight is the best idea for novice enthusiasts. We live in a modern world with far better materials and researched based design. I'm sure those guys were around today we'd have to fight them out of our camp for always borrow gear.

Although I share none of the romance for replicas, hero knives, or any other modern take on knives from antiquity, I can see why some love em. Have at it. I'm for keeping the lights on for guys like Dozier. It's this battle of the lists "My list kicks your lists ass" mentality that has nothing to do with the outdoors and more to do with keeping score that has presumed a persona that I'd like to steer as many good outdoors people away from as possible and instead foster good habits for learning.
I'm for just about anything that gets people out in the wilderness, but as long as it retains a message of respect for nature and not trying to prove something over a campfire. I'd rather people learn the fundamentals instead, not just how to light the fire, but where to have it if at all, and how to put it out properly. Perfect scenario, week before last @6,000ft elv. south of mariposa grove I came across a haphazard fire ring that had been left for at least a few hours still smoldering enough to bring my coffee water to a boil. I don't have to mention the insane number of fires up in that area this last month. That kinda stuff is what I'd like to avoid. It's what's in your head that counts, not what's riding on your hip.