Most shields are Uno footprint, I think.
...because a "shield" for a Nano would be, well, nano sized.
In practice, it's not often you need to connect more than 1 wire to the pin of a Uno, Nano or DIP chip. Where you do need to to that, you can usually daisy-chain wires from one component to the next with those other components on a Breadboard. Or you can take 1 wire to an empty row and take multiple wires onwards from there.
With an Uno, you only ever have 1 socket per pin, except maybe a couple of ground pins or SDA/SCL + A4/A5. So you have to use a breadboard if you need to branch out connections to several components.
Most decent breadboards have at least one pair of power rails, so a short link from the Nano 5V, 3.3V and/or ground pins to the rails is all that's needed in my experience.
If a Nano specific breadboard was made, it would be so specific that it would not sell in large volume and be expensive as a result, I think.
All of them, I would say! That's what makes a shield a shield. Shields and Unos/Megas are a great match. Nano and breadboard is a good match. Uno and breadboard? Not really....
PS. The breadboards I use go one better than the average breadboards, they have 6 holes per row instead of the normal 5!
Everything you say is true Paul but I still think that
Not that I think anyone would ever produce one as a commercial product
Oh yeah? Well do your amplifiers go to 11?
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