I'm a fan of ana-digi combo watches. One near universal problem is the hands move above the digital display on the face and at times obscure parts of it. One solution is to make the hands sweep area smaller and have a separate digital display area, like these:
One issue with those solutions is it makes the total watch face larger than it needs to be, and the separate hands and digi display smaller and less legible.
After getting a smartwatch last year I played with a face design tool and came up with a layout with a circular digital display in the center and the hands sweeping under it, visible around the edges. Simulating a floating digital display surface in the center that's always visible . Here's the result:
Obviously I'm not a sophisticated designer, but that should show the concept. What I would like to see in a mechanical watch is a central raised "island" where the digital display would always be totally visible, with analog hands around the outside. It could also have room for both digital time and day/date, and still allow the total face size to be optimized. I can't think of any technical reason why that couldn't be done, and it could be a unique and appealing design.
Hope that inspires some real designers, or posts of examples I'm unaware of where it's been done. Comments welcome.