8 words is enough without a KDF. If you know 7 of the 8 words and there is a KDF, you might not be able to figure out which word is wrong or missing. But if the

8 words is enough without a KDF. If you know 7 of the 8 words and there is a KDF, you might not be able to figure out which word is wrong or missing. But if there is no KDF you may be able to forget up to even 3 words. Being able to brute Force your own password is a good thing if you can at least depend on knowing most of it.