I've heard people say that Canon takes a priority over Non-Canon, but does it? If so, why does it? You cannot have fluency with the pure canon alone, so is it that you use canon if you can? If it can't be expressed with canon then you use Non-Canon? How does this work?

Canon is from the games itself. Canon examples include Fus, Ro, Dah, Vol, and more, they are directly from the games.

Semi-canon are words like one of the words directly from the game, and they are related, but arent from the game.

Non-canon has no relation to the game, yet are somewhat not as off-topic on the game as much as the Modern words. These are a type of word you will see very often.

Modern words are words that have no relation whatsoever, like computer, or car.

BoDuSil

Canon is from the games itself. Canon examples include Fus, Ro, Dah, Vol, and more, they are directly from the games.

Semi-canon are words like one of the words directly from the game, and they are related, but arent from the game.

Non-canon has no relation to the game, yet are somewhat not as off-topic on the game as much as the Modern words. These are a type of word you will see very often.

Modern words are words that have no relation whatsoever, like computer, or car.

But you have those with a "bias" towards canon. Does it really matter which you use, so long as the point is made?

A couple reasons. Something to keep in mind about non-canon is that no one outside of this site will understand it. Even people who are familiar with this site are mostly going to know canon words rather than the non-canon. It's best to use words that others will likely know.

The non-canon words have a habit of changing. Some words were made a while back before certain rules were known, and need to be changed. It's all a work in progress. Having a bias towards canon words greatly extends the longevity of your writing, or whatever you're using the language for.

Speaking in a canon-biased way also helps enforce the language's archaic or brief style. This is something that's really hard to teach. Compare these two translations of "I'm going to teach you about using canon words."

Zu'u los botaas wah mind hi do brahtaas oron rotte. "I am going to teach you about using canon words."

Zu'u nu bolaav hi onikaan do kod vahzen-rot. "I now grant you the wisdom of wielding true-words."

The first one could have come straight from the translator. It's not technically incorrect, but stylistically, it doesn't fit the tone of the dragon language. The second one uses canon words only. It sounds funny to the modern English ear, but captures all of the archaism and metaphor that really makes up the heart of the dragon language.

Vahzen!