>>1527996
Indeed, it is a good thing; Touhou is popular because its explicitly open to a huge realm of possibilities. Unlike most fantasy worlds, it doesn't even have a single set of agreed-upon lore or even agreed upon magical laws. Despite having an enormous amount of canon material, it manages to avoid the traps of most fantasy worlds, where most of the interesting stuff is set in stone before fanon even gets to touch it.
Of course, this is all done by being intentionally vague about everything and having every single "in-universe" source being rather unreliable. It also helps that Touhou basically throws the kitchen sink at every fantasy concept: it has contained at some time basically every type of magic known to fiction, from hermetic to device magic, and more different fantasy creatures from different mythological backgrounds than Tolkien ever thought you could fit in one world.