Why wasn't Dave Filoni a part of the writers for the Star Wars sequel trilogy?

I know he's not perfect and that he sometimes can drift off of the Canon universe a bit... but does it even compare to how poorly the sequel trilogy went? I actually liked the Clone Wars and was expecting him to be the director of the sequel trilogy or at least some screen writer. Were they just not confident in his ability to make a Star Wars movie?

Why wasn't Dave Filoni a part of the writers for the Star Wars sequel trilogy?
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