tripleaamin
All Star
It's probably the best anime that I have seen that truly feels like an adventure in a fantasy world. Still need to check out Witch Hat Atelier how it differs. Also, the world building in terms of magic is outstanding.I'm not sure you can pinpoint that with Frieren tbh. I think its big appeal is the setting, pacing and the flawless harmony is shows with its limited action, character development and lore. I don't think there's a point the series "changes your mind" like with HxH or other series were the first/second arc are its lowest and then it takes a big jump in quality.
Besides add in the themes that it presents for each of the trio. For Frieren the passage of time is something foreign to her being an elf. For Fern, her evolution in a mage also comparing that to mages like Serie and Flamme. While for Stark, what it means to be a warrior. Frieren is a type of show where there are things you can miss your first time through, and it becomes more apparent on a rewatch where you be like
Series like Apothecary Diaries, Dungeon Meshi and Monogatari have that same feel to them where you really don't digest everything the author gives you your first time through.
Now if you're looking for a story focused series where the plot is the central thing and moving forward, Frieren is not that. It's about the journey not the destination.