Seems an interesting idea but I don’t think that you can reduce the issue of new (Karbe) vs. old (Mandler) lenses to nostalgia. There is a good deal of old lenses that aren’t really interesting. I really don’t see for instance the worth of bringing back the Summaron 28 and I am very sceptical about the Thambar 90 too. Here I suspect Leica of exploiting nostalgia for commercial reasons. But this is not the whole story.
Of course not. Karbe vs. Mandler (or Berek for that matter) has not much to do with nostalgia indeed.
I was only speculating that a certain group of people, who just happen to be more prone to nostalgia, are more likely to buy a Monochrom and own vintage glass - and may actually prefer a certain type of lens rendering, or even haptics, to another.
And yes, I'm with you regarding the new Summaron and Thambar. But whatever the marketing and financial reasons for these re-issues, they are fine by me if others enjoy them and the revenues generated support Leica's development.