This is and this is not a problem, from my point of view.
This is a problem because if Patek wants to use such a small movement in their watches, they should, maybe, think about releasing a smaller case, around 34 / 35 mm.
What? There will not be demand for that? See JLC with the MUT... Not big sales, but enough to justify this 34 mm in the catalog.
Now, put a solid case back, and like with the 5196P, you have a superb watch.
So we really need to see the movement?
How the amateurs of Belle Horlogerie did in the past, where there was no sapphire case back, eeeh?
Best,
Nicolas