Agree with you on the pre-OT stories. Filoni did a masterful job telling compelling and varied stories. That's why I enjoyed Clone Wars so much. Rex, Ahsoka, Ventress, and others were given as much narrative attention as established characters like Kenobi.
I don't know if he would be as successful with the latest trilogy. That trilogy was a damn mess with no clear vision or narrative flushed out. It was a Disney, rush to market, money grab, operation. With his other work, he had the benefit of questioning Lucas on what George meant to do and what he was trying to say in the prequels. It allowed him to expound and bring more weight to material that had been poorly executed by Lucas.
If he were to quiz Abrams or Johnson, I don't know what they would say to him. He tried working with the gaps in the latest trilogy with Star Wars: Resistance. It was not good. In part, because the world building in the latest trilogy sucked.
All that to say, I trust Filoni.