@HayashidaYuki
I don't think you guys understand my point so I'll explain more clearly, the point is not that Elves are not conservative, the point is that being conservative would not them follow the Human version of conservativeness, to be closed to new theories to a point where it would hinder the advancement of their magical practices, which is something that does affect humans.
The creation of Simlarils, already shows that they are open to the advancement of their techniques.
The point I was trying to make is that they cannot be judged under human concepts.
Because while they stay young, their brain doesn't get slower or ultraspecializes like a human brain would, as they don't grow old.
Humans become less accepting of new concepts because our bodies grow old, and start losing genetic information by the droves, which in turn overwork our brains which starts discarding unused information and focusing on the most well used skills, which is why people usually prefer to specialize in something. Elves don't grow old, so they don't lose genetic information, at least not in several centuries(because they do grow old after several centuries in SOME stories).
So them being conservative and resisting new findings like what happened with Einstein and his theory of gravity which was rejected multiple times by the older scientists. It simply wouldn't happen to elves, they would recognize the validity of the new theory or practice, they would try it to see if it worked and they would accept it. And since they live much longer they would be way less prone to being excessively conservative because they would suffer the brunt of their mistakes themselves. While humans die within a century, that why when something goes wrong only their grandchildren will feel the results, and that's why we have scientists who resist changes. One last thing, if even with all this information the elves still show themselves to be conservative, is because the specific practices they are defending, are still functional and meaningful.
You can easily see that in D&D, where high elves are very arrogant and conservative but they do learn from their mistakes and ban practices that were proven to bring catastrophic results immediately, It's why Moon elves became way more open to other races in Forgotten Realms, their pride brought the fall of their old, prosperous kingdoms. Even the very conservative Sun Elves knows to accept new suggestions when it's proven to show better results. Unlike our society which stubbornly uses several old rules and measuring units that are no longer relevant to current technology(like Fahrenheit and Foot for example)