system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Why isn't there more scientific advance in Middle Earth?

And I don't buy the usual "because they had magic they didn't need to develop technology" thing. That is fine for the Elves of which every one could sing out a magic bow out of a tree, ok. 

But Men? Except 5 Wizard (which just look human but weren't) and some bloodlines living longer and the Righteous King having a healing touch there wasn't any magic for mortal men.

So why in a continuous thousands of years old civilisation was there no good technological advance? More then so seeing as at many times humankind was at war and scientific progress is seven times quicker during war.
gpt
>scientific progress is seven times quicker during war.

This is a sort of Sid Meier's Civilization way of looking at scientific progress that doesn't apply to our modern world, or to the Third Age. Science is a process that the Third Age simply didn't have. The process of hypothesis, test, confirm/deny, re-hypothesize simply wasn't conceived of at the time.

Second, they had access to things that science just couldn't account for. The Tower of Isengard was a single, impossibly huge piece of rock, shaped by unknown means into a great fortress. The Palantiri were stones that allowed sight and hearing across vast distances, with no discernible mechanism. The list goes on. No science can explain them, certainly not the science to which the Dunedain had access. They are just things that are, parts of the world that are inexplicable. The people who made them understood something about the world on a fundamental level that is impossible to explain to another person.

All that is to say that craft, not science, is what happened in this era. Craft is more than a method, it is a process of doing and understanding that is not necessarily falsifiable or transferable. It requires a certain creative spark which not all Men possess. After the fall of Numenor, Men are weakened greatly in their strength of spirit, and their talent for craft wanes over time. This has to do with a lot of things -- the constant presence of strife, the shorter life-spans (and thus less time for study and contemplation), the growing concern with power, its maintenance, and its acquisition, etc. 

Another aspect is that craft has a certain spiritual element to it. It is creative in the way that art is creative -- it requires something of the artist. Feanor, after crafting the Silmarils, said that there were some things he could only accomplish once, and they were such things. Even the Valar were unable to remake the Two Trees after Melkor destroyed them. When Men declined after the fall of Numenor, their capacity for craft declined with their spiritual and temporal might, for various reasons.