wait so it is useless as an error detection tool? any mistake you make in one of the words there's a 1 in 16/1 in 256 chance it will not raise any flag and be happy to let you use that set of words. if that's the case then i'm not sure what purpose it serves.
Checksum in mnemonic algorithms serve more purpose than just error detection. For example in BIP39 it also works as padding since each word is 11 bits and 12 words would be 132 bits while it is easier to generate entropy that is multiple of 8-bit. And in Electrum they act as the version to announce the child address type that has to be derived and their derivation path.