In the hypothesis that the VM is a medical compendium, what is each section?

[MarcoP]

Thanks Marco, these quotes do point in the direction of a medical compendium. I also agree that Panofsky's interpretation appears speculative, as if he did not want to dig too deep.

Panofsky never contributed anything extensive about the Voynich manuscript. The fragments we have are necessarily broad and not too specific. More than an unwillingness to dig deep, I guess his problem was the impossibility of applying the method he described in "Iconography and Iconology".
His method is based on the interplay between visual and literary traditions. In the case of the Voynich, the connection with literary traditions is impossible because the text is unreadable and the images are too unique to hint to any specific textual tradition. Panofsky was perfectly aware that images are always ambiguous and image-only interpretations are unreliable.

Would it be fair to say that such remarks tend to look at the manuscript with a birds' eye view, without necessarily getting into the details? (This is not meant in a dismissive way: each perspective has its merits and most readers would probably get a cursory glance at most pages). Or, put differently, that specialists feel more confident assessing the overall themes of a section rather than getting into all the details?

Yes, I think this could be the case. Or maybe we could say that specialists try not to write about the Voynich and (when they do) they write as little as possible.
A meaningful detailed analysis may well be impossible. This is particularly clear for the "herbal", which makes up 56% of the whole manuscript. It seems obvious that it is a herbal, but it is very difficult to say anything specific about the individual plants. Touwaide 2015 proposes a couple of specific parallels with other manuscripts (Manfredus BNF Lat 6823 and Sloane 4016); apparently he concluded that there is a connection with the Circa Instans aka De Herbis tradition, but the plants are different. I guess that going into the details for the Voynich herbal would mean tracing possible sources for most of the more than 100 large plant illustrations: again, since the images are so unique, in many cases the only options will be either speculating (something that most scholars don't particularly love) or saying nothing.
Even when the text in medieval herbals can be read, the plants are hard or sometimes impossible to identify and the origin of the text remains obscure (I am thinking in particular of the so-called Alchemical Herbal and of Trinity O.2.48). If one cannot read the text, there is not much left for meaningful discussion. I still hope that Touwaide will publish more about the subject: he is one of the very few people who can say something interesting about the Voynich herbal, under the current circumstances.

Coming back to Panofsky's and Touwaide's analyses: when comparing them, the obvious difference is that Panofsky appears to interpret Q13 as allegorical while Touwaide takes it literally. In this case, my personal preference goes to Panofsky. I also find his interpretation very logical, which is the best that can be done when speculating: the herbal and "jars" sections seem to be about plants; other pages appear to be about astrology and the cosmos; Q13 is a mystery, but one can speculate that it represents the connection between the cosmos and plants i.e. "celestial influences transmitted by astral radiation and those 'spirits' which were frequently believed to transmit the occult powers of the stars to the earth".