... completely break with backwards compatibility
The problem is, that you either have to loose compatibility with all shield that exist to the day or that you begin to make a workarround
I've dug through most of the 'Uno Punto Zero' suggestions, and the one I haven't found (which I'd expected) is the proposal of adding a third, 0.1" grid compatible row of headers, like a Seeediuno.
I would be very surprised if the people involved with the 'Uno Punto Zero' effort would ever try and implement any hardware changes at all.
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