Plenty builder
Match the protection to the failure.
Adding security parts is useful only when the new part addresses the risk you actually named.
Blind guessing with More recovery words: Helps under conditions. It enlarges an already enormous space.
Blind guessing × More recovery words
It enlarges an already enormous space.
The attacker knows nothing secret and searches complete candidates. Going from correctly generated 12-word BIP39 to 24 words raises source entropy from 128 to 256 bits. Blind exhaustive search was already outside plausible classical reach.
Helps under conditions
New tradeoff: More words to copy, conceal, inspect, and recover.
This is a teaching comparison, not a personalized custody recommendation. Every real setup needs independent review and a recovery test.