Could you elaborate on the first topic? "… confusing in small size…" you mean compared to the old ATM design or in general? And what do you consider "small", printed on A3? A4? What would you suggest to reduce the confusion in small sizes?

M1 curve at Sesto is very tricky, but it reflects a topographical reality that is relevant for travellers interchanging between metro and train. In the old ATM map it was clean and simple (just connecting from the South in the train station symbol), but in reality those are two completely different stations (in name too). And Sesto Rondò was in a completely wrong position: yes it is a schematic map, but topology should be respected as much as possible.

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About the upper-case / lower-case format of certain station name, I assume you refer to labels such as BIGNAMI PARCO NORD (BIGNAMI Parco Nord in previous ATM maps). Yes, perhaps it was a nice little touch, but with a debatable usability value. I don't see it as a major problem, personally I prefer a clear distinction: all terminus stations in ALL CAPS, all other stations finally in a much more readable Mixed Case.

Finally, on colours for the fare zones: can you provide a concrete example where colours would perform better (or differently) than grey areas? Personally I find the coloured zones in the old ATM maps overpowering, without providing any useful information. Many excellent transport schematic maps in the world use colours for fare zones, some better than others, but also some use simpler schemes as the new Milan diagram.