BTW, just 12 worlds is enough for derivation. The benefit is that you can remember your seed phrase quite easily.
Discussion
How do you define “enough”? If anyone where to use BIP-85 for their whole key setup i would definitely recommend getting 24 words
The used derived entropy is roughly 128 bit. So there may be an advantage for finding seed words, but not for the derived keys. https://bitcoin.stackexchange.com/questions/48258/the-length-of-the-bitcoins-private-keys
This is true for every single derived key, yes. However if your parent key is the source for many different key sets (as it is the case with bip-85) the strength of the parent is most important