Its probably not restricted as BLM or WHM because as Red Magic developed over the course of centuries, its aim was to build a style of magic from its foundations that could not harm the world through the use of channeling ambient aether as BLM and WHM did. Thaumaturgy is often referenced in the questline due to its similarities of channeling from your internal aether reserves. And many practices that could be seen as potentially harmful, such as anything involving void magic, is forbidden from use, so that neither would be part of its core teachings. Its methods will never be as powerful as BLM and WHM.
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"As with any good tale, we cannot so easily predict its ending. Never close your book too soon, for there are many chapters in your story that remain unfinished."
"As with any good tale, we cannot so easily predict its ending. Never close your book too soon, for there are many chapters in your story that remain unfinished."