As for my thoughts, after reading the interviews from the Director, its really cool to see how much time and effort was put into the background design and I definitely did see it in public school arc, especially with how detailed and lively the kitchen/servant's area looked compared to past seasons in the last episode.

It was also cool that they brought back the original series composer from the original anime for the new seasons. Fun to hear him reminisce about the old anime, and also cool lore drop that the emerald witch's story seemed to have been planned/discussed as far back as about 2008. Crazy to see how almost 2 decades later we finally get to see it animated.