Originally posted by Darth Thor
"I never saw this as being my ANOTHER Prolonged Lightsaber duel because that would suggest no growth" (paraphrasing a little).
The above says absolutely nothing regarding the following assertion you've made:
Their growth in fighting each other, yes.
And you keep ignoring how, in the sentences right before he mentions growth, he gives them being "very good swordsmen" as an answer to the question of "why was the fight so short?".
Them being very good swordsmen and them growing in general doesn't indicate that they only grew in regards to how they fought each other and that said growth would only apply when facing each other in a fight.
How they fought each other was a result of their growth, not the reverse.
Originally posted by Darth Thor
The three-shorting Maul was to make it clear Ben is now the superior of the 2 leaving No Doubt about it.
Filoni makes that clear when he states "I felt that every time Maul parries Obi-Wan it suggests they're equals and I don't think they are.." (again slightly paraphrasing, but the important words which support the meaning I'm alluding to are there in the actual quotes).
Now explain how Kenobi being better than Maul contradicts the notion that he's vastly superior?
That Maul isn't equal to Kenobi doesn't mean that he's far below Kenobi. Especially not to the extent that he could three-shot him without the aid of the multiple circumstances that only apply to this specific fight:
Andi Gutierrez: "The actual duel between the two Masters is very short, like a samurai film. How did you come to the conclusion that it had to be done this way?"Carrie Beck: "We never entered into this story trying to think about how satisfying that battle should be, it really became about what was the genuine intention of this moment and knowing where these two men are at this point in their lives. I think it's important for us, even though on the timeline we aren't to A New Hope yet, to think about what we know of Obi-Wan in that movie and work backwards in some way, to make sure that the character's progression charts appropriately."
Henry Gilroy: "When you fight someone many times, and have faced off, you kinda know each other's moves, so if you think about it, the biuldup to this confrontation and the actual lightsabers hitting each other is actually longer cause they're basically playing it out in their heads, and the amazing thing is the move that Maul tries after the initial exchange, he actually attempts the move that killed Qui-Gon Jinn. He tries to basically bash him with thehilt."
Dave Filoni: "If you talk to a lot of people that sword fight, they'll tell you people that are very good don't have long fights. It's very quick. And so that scene, it's an homage to the Seventh Samurai. I think on one level people would be excited to see another prolonged lightsaber fight but I just never really saw the confrontation that way because to do that is to say the character's don't have growth. Yes, it's exciting as an audience member but it's not a really believable thing. The story telling has toevolve."
Source: https://www.youtube.com/watch?v=8eIZsJsck7A