A hypothesis on why/how the VMS was made

[ololololo]

The herbal/medical section deals with physical, descriptive data - plant parts, preparation, dosage

Parts of the plants are not explicitly described there. There is a pharmacy section for this.

What's interesting is that Voynichese looks like it's doing something similar.

There was You are not allowed to view links. Register or Login to view.. It belongs to the category of false hypotheses that are complex and absurd in themselves, but are very well applicable to VMS.
Abbreviations work a little differently... They can't turn the language into Voynichese.

Given the Constance connection, my guess is that if anything like that survived, it's more likely sitting uncatalogued in a regional Church, guild, or municipal archive near Constance/Lake Constance than in a well-known collection - the kind of document that wouldn't have been recognized as significant unless someone was specifically looking for Voynich-adjacent notation.

I don't really understand how Constance, Jan Hus, and VMS are related. Perhaps the VMS theme itself is dangerous or very "unconventional" for that time. The author has many more reasons to encrypt this text.
I think it's most likely that the VMS was produced in Central/Western Europe, based on its style. However, it could be from anywhere, but it's unlikely that a Turk or an Aztec would copy illustrations from European books for their strange manuscript.

In general, there is nothing new here...