A couple of clicks and I ended up having browsed to this old thread...
It's quite understandable to think -- even to scoff -- that it's a flaw in
Tolkien's histories that there is no technological development across all 3000 years of
Gondor's history, like there would be in "any society". But Tolkien obviously chose not to, and it's usually dangerous to argue with him!
For one thing he had to have a decline, because his plan was to provide a rich mythical alternative history of our world. This obviously couldn't have just developed onwards and upwards until it became ours without clashing with the history that we already have. Ultimately it all had to die out and leave wilderness with no more than scattered barbarians from which our accepted history could start, only eventually rediscovering the
technology of steel etc.
To 'play the game' we have to accept this and then try to figure out why it was the way he described.
There has to be a fundamental difference between Tolkien's phase of imaginary history and our more modern history in which "any society" would achieve technological advancement.
I think the difference has to be in the 'religion' of Gondor, which styled itself (one of) the
Realm(s) in Exile, dominated by
the Faithful descendants of
Númenor. Their religion was to maintain the faith of
Eru as described by their friends the
Elves, in which lores such as technology were the gifts of Eru (possibly via the
Valar) given to the Númenoreans, but lost in the
Akallabêth. Perhaps it was inconceivable, or perhaps it was even 'heretical' that they should try to rediscover or reinvent these things that were a divine blessing. Perhaps this was why their greatest minds turned not to engineering and invention, but to potions seeking to prolong their lives, or to foolishly seeking the secrets of the future in the stars (as described in a speech of
Faramir's).
It is tempting even to suggest that the Valar actively prevented technological development, having seen the Vision of Eru as not including any technologies beyond a certain level. This admittedly ought to be unlikely, since we do know of the development of blasting fire that seems very similar to gunpowder, and since we are told that the Will of Eru is "as fate" to all the Children
except Men.
--Os.