Raison d'etre of the Voynich?

[Mark Knowles]

Of course, the Voynich is a very unusual document, so there could be a very unusual purpose behind it. Or it could serve a not unusual purpose, but merely have a very unusual means of realising that purpose. So the author may have had some very rare or very unusual knowledge which they made use of to achieve their goal.

When it comes to determining purpose I think we are way off that yet, but still it is interesting to speculate.