While @Forresto has my love and vote if he runs for Moff of say, the Sector with Pluto in it and I agree with many things that he has said, I am also the first to say, while it is far from perfect, given what Rebels set out to accomplish, they did it quite well and am I thankful for many things they brought back into Canon.
And yes Rebels is indeed a ‘children’s show’ but there is poignant wisdom, and deep beauty in the series, as well as strikingly powerful scenes like this one.
This scene can stand up on equal footing with others from the Saga Movies, and doubly so when you see Obi Wan only shows emotion when his charge (Luke) is threatened.
And for your literal deep cut, the move that Maul uses does not trick Obi-Wan because he saw the former Sith use it to kill Qui-Gon.
Filoni is not the ‘savior’ of Star Wars, what he is though is rather simple, he is one of us, a fan.