I feel like Shadowbaby kind of did that, but it was still fairly blatant.
To be fair a lot of low fantasy/dark fantasy actually only has “blatant” magic, looking at fantasy lit., I think it’s a minority that have “mysterious magic”. And some of the most truly mysterious and magical ones, like LeGuin’s Earthsea books, are high fantasy, essentially.
It really doesn’t help that perhaps MOST fantasy readers, or at least a large proportion, have completely terrible taste in what is “good magic” in a book, and would rather have some of ultra-predictable, totally follows some very clear rules, nothing mysterious happens that isn’t explained magic-system where they can feel clever for guessing how magic would be used, than an actually mysterious or magical-seeming magic system (or non-system, as it may be).
As evidence: the entire success of Brandon Sanderson, who cannot write a good character to save his life, doesn’t have great plots, and generally ruins his semi-cool settings by overly-convoluted backstories that inevitably have the bad-guys-being-the-good-guys-but-actually-they-ARE-bad-guys-but-you-gotta-understand-where-they’re-coming-from-man (in an initially interesting but ultimately tedious and morally vacant way), is only okay at writing non-magical action, has no ear for dialogue, on so on, but motherfucker can DEFINITELY write any number of highly coherent, predictable, sense-making “magic” systems, which are definitely not at all mysterious seeming except in that they’re slowly revealed.