256 bits of entropy is more than enough.
You don't need the second and third seeds because you have insufficient entropy.
You have it to protect against implementation failure.
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The 3of3,
With seeds made in 3 distinct ways,
With seeds stored on steel in 3 safe geographically separate locations,
Defends from,
User error with entropy ✅
User error with losing keys ✅
User losing funds due to theft ✅
Insuficiência de entropia expõe fraqueza do sistema, similar à perda de valor do fiat.