copy of an older, barely legible manuscript?

[JoJo_Jost]

If you were unsure/working out, new vellum would be a very strange choice. I'm not sure there's other examples of this.
If we are to take LFD "many scribes" work as correct, it's hard to see a group of people doing this rather than using a chalkboard and talking about the possible/correct interpretation or something along those lines.

Thank you very much for taking the time to give me such a detailed answer. Now I understand what you mean and I cannot refute it.

Nevertheless, I have a different opinion.

Because what do we see today? Many people invest an enormous amount of work, time and, in some cases, money in carefully examining the Voynich Manuscript. Why should it have been any different back then?

Imagine that a wealthy person of that time purchased this book at great expense because he was convinced that it contained magical, mystical and, in any case, secret knowledge. But of course, they had great difficulty deciphering the writing because it was rather illegible, so they commissioned one or more scribes to copy the writing as accurately as possible in order to be able to decipher it better. They used parchment because they could afford it and because they were convinced that this mystery had to be recorded on parchment.  Of course, this is only an unverifiable theory, but it would explain the problem with the vellum and the different writers (may be he had fired the first one... ) .

The following, imo, takes it from unlikely to incorrect. 
If the idea is that people were unsure about if a glyph was o, qo or y etc, we wouldn't see the positional variance (or lack of) with these glyphs.
You would expect to see words that end in qo and o with great frequency as they didn't know if it was o, y or qo, but we don't, they are mostly just y.
This is just one small example and the further this idea is expanded the clearer the issue will be.

I'm not sure if I've been understood correctly here.
There are certainly various reasons why many of the same words appear on a page. This has already been discussed at length. But that's not what I'm talking about (I'll write another post about that later).
There are two different things that I suspect are related to the poor quality of the underlying text.

1. Parts are difficult to decipher. Perhaps they are blurred, corroded or mouldy. This can be seen in sequences where words (or in most cases even several words) that are very similar are written with different glyphs that have the same ascenders or descenders. This pattern also makes them easy to recognise. I believe I have sufficiently explained this here and it is not a matter of every o y q being unreadable.

2. On the other hand, there are also many identical words in the text. But that is a different problem.

Several possibilities are immediately obvious to me:

a. Take a look at medical recipe books from this period; only a very limited vocabulary is used to describe the processes.
Frequent words are honey, oil, wine, dissolve, vinegar, dry, cook, etc. So you should find many words that are repeated on such pages.

b. The direct repetition of the same words in succession can have two possible explanations.

i. I suspect that these words were different in the original manuscript, but the copyists did not notice this difference or they standardised it. This is something that is still done today, see Eva transcriptions (this is not a criticism! I understand the necessity of this). I will soon publish an article here that describes this very problem and at least substantiates it as a possible thesis.

ii. Word repetitions can also be seen as reinforcement: Cook, cook and cook it. To make it clear that it should be cooked for a very long time.

iii. Repetitions of identical words are also normal in languages:

Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo

‘It remains true for all that that that that that that that refers to is not the same that that that that refers to.’

out of voynich 15v.2: orororo Raiin/  or Ligatur = ore; oro; ro Ligatur = ratio; Raiin= regat / ore oro; ratio regat (joke).