Coaxium makes no sense. Let me explain.
Coaxium as explained by the new canon especially in Solo: A Star Wars story, is a rare hyperfuel that requires advanced refining to be used. It is also highly explosive. It is so rare and valuable that it becomes the primary mcguffin for the train heist in that movie.
This is also the justification for why there is a "fuel crisis" in The Last Jedi.
But Coaxium is a lore breaking retcon. Hyperfuel cannot be rare and expensive in Star Wars or else nothing about how hyperspace travel in any of the non-sequel 7 movies makes sense. Throughout all of the OT, PT and Rogue One, characters are jumping all over hyperspace constantly. They are able to do so almost leisurely. Even Luke Skywalker who grew up as a poor moisture farmer on Tatooine was able to purchase passage to Alderaan just by selling his speeder. If hyperfuel was so rare and expensive a journey like that would make no sense. Luke was planning on going to the Imperial academy to become a pilot, how would Owen Lars a "moisture farmer" have had enough money to send him across the stars to that academy if hyperfuel was such a prohibitive cost.
However there is a whole other layer to this problem. In Episode 1: The Phantom Menace the entire opening plot of that movie is about how the taxation of trade routes has led to a blockade of Naboo by the Trade Federation. This implies that there is galactic trade. If hyperfuel is such an expense how does an entity like the Trade Federation even exist? They are so rich and powerful just from moving cargo around that they have enough money to fund their own private armies. If fuel was such an enormous expense how does the Trade Federation make such an enormous profit?
There is also the problem of Coruscant. Coruscant is a planet sized city, with absolutely zero farmland. It is explained in canon that it has a population of 1-3 trillion residents. How could a world like that possibly exist without massive daily imports of food, water and other natural resources? Are we left to assume that FOOD is transported via this very same expensive hyperfuel?
When you ask that question it peels back how impossible the galaxy as we understand it would be if Coaxium was such a rare and expensive resource. Perhaps there is more than one way to make hyperfuel. However that still begs the question, why would coaxium have so much value if it was only one method out of many to produce cheap reliable hyperfuel?
Nothing about this concept of rare and valuable hyperfuel makes sense. It completely breaks the galaxy as we know it. Thank you for coming to my talk.