The scenario in the game goes like this: you have a Big Battle Hammer that does 50 damage. Then you find a Massive War Sledge that does 170 damage, with all other things being equal. In the game, you wouldn't dismiss the new weapon out of a "bond" you feel toward the old one. It's a game, so you pick up the Massive War Sledge happily and discard the old weapon without a second thought.

In real life, it's much easier to grow attached to things. I don't think it's good to keep buying new clothes all the time. I'm talking more about technology and tools that actually do things better than the current ones.

This rules out electric vehicles, by the way, since they are at best on par with the current technology. In many circumstances, they are actually worse than their gas- and diesel-powered counterparts, such as in handling long distance trips and extreme cold. 

If an electric vehicle came out that was truly better than a gas car, it would be foolish to hold onto the current ones. 

As a hypothetical, consider an electric vehicle that gets 30,000 miles on a single charge - a charge which takes 1 minute to complete.

If such a vehicle existed, no one in their right mind would buy a gas-powered car.

As it stands, though, electric vehicles take 10 to 100 times longer to charge than it does to fill up a tank of gas. Yet even with that extra time spent charging, the range of the charge is comparable to a tank of gas in terms of mileage.

This hypothetical may have made it seem like I diverged from the topic of "Use Every Resource", but the opposite is true: the point of "use every resource" is to use every good resource; use every new and improved resource. 

It means that when muskets arrive on the battlefield, abandon the spear and javelin.

Your tools are what give you an edge in your task. When a new one arrives that makes that task much easier to perform, take advantage of it.