Make a 24 word seed Use the first 12 words as a decoy Use the second 12 words as a decoy Use the second 12 plus the first 12 as a 24 word decoy Now you have three decoys using the vast ecosystem of 12/24 phrase storage tools and no one ever has to lose funds because wtf is a 25 word seed

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Splitting a 24-word seed does not create two valid 12-word seeds, the checksum fails. And even if it were the case:
daniele's avatar daniele
Even with the best UI, storing many seeds (an well know format, easy to spot) is more complex than having one seed with a customizable additional layer of security. I repeat, for advanced setups, not the casual user.
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