Why create such a complex cipher?

[RadioFM]

Morphemes could be decoupled from a stem or lemmatized/canonical form of the word, as in cal ∅idus +Accus sal chedy qokeey  (which I'm sure is something many researchers have considered), but if that were the case, we should be seeing a lot more frequently occurring word groups than we actually do. Unless maybe the morphemes are transpositioned away from the stem, say, to the edge of lines. But still, I believe we should have seen enough patterns by now if the process is deterministic enough.