Tobin wrote:What archaeological record? We have depictions and THAT IS ALL.
So, the following are what, depictions?

Tobin wrote:And my point still stands, the Lamanites did not have Nephite technology at that time. We are talking about weapons fashioned by Lamanties in the relevant verses.
So, your position is that the Nephites left no trace of their technology, and when they merged with the Lamanites, they abandoned their technology in favor of the cruder Lamanite technology? Now you're really reaching.
Tobin wrote:Again you are making assumptions about how the technology was used in other areas and how generalized the knowledge was. Technology does not necessarily develop that way. It is known that iron forging was a specialized craft long before the bronze age ended (even in 600 BC), but it was known to a select set of people and not generally utilized until the era ended when it became generalized.
Now you're suggesting that a technology Nephi says he taught to his people and one that was practiced by the Jaredites for a millennium was known only to a select group. Again, serious reaching here.
Tobin wrote:That is quite incorrect. For example, the ancient Greeks invented gears and a steam cannon. This did not lead to the industrial revolution.
What would be incorrect is the notion that high-heat technology would have no noticeable impact on the broader culture and industry, which is what you are suggesting.
Isolated technologies are often lost (even in our civilization). Another example would be automata. Watch makers to display their craft in the 18th and early 19th century would create robots that could write poems, sign their name, and even draw. This did not lead to a break through in robotics or computing and eventually the craft was lost. It just isn't how technology works (even if surviving copies of the work exist).
We're not talking about breakthroughs but in noticeable impact. (I note that you're reverting to strawmen again.)