Why create such a complex cipher?

[Rafal]

If this was the case, with no extra tricks, I suspect VMS riddle would be extremely easy to solve, much easier than Rohonc. There are hundreds of labels in VMS, if, say, "otarly" consistently meant "water" and "okaldy" stood for "hot" (both examples are made up), there would have been multiple convincing reading already. I'm almost absolutely sure that if this is a cipher, it's of a one-to-many type, with several possible ways of representing a single plaintext word.

Well the problem is that there may be not a single "hot" word:

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So you may have different forms of "calidus" word in the ciphered text and don't know that they are forms of the same word.

Declension of words makes much harder to spot word patterns. Rohonc Codex seems not to have declension so it has much more repeated patterns than Voynich.

I would like to try once to search for word patterns (taking into account the declension), assign meanings to words and see if it works in other places. As far as I know nobody tried it seriously so far. But it would require time.