It would be helpful to quantify "plenty dense" here. Paris has a population density of 21498/km2. Turning that around, that's roughly 46 square meters per person. That doesn't leave a whole lot of space for a potato plot if you're supposed to cook and eat those potatoes somewhere, too.
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This is a false choice. Urban agriculture doesn't need to mean indoor agriculture / relying on excessive electricity / complex equipment etc.
Cities can be plenty dense while still having enough space for people to grow potatoes for themselves and their neighbors.
You’re right. Urban farming with sunlight is fine. My energy arguments only apply to growing under artificial light.
Is it? That seems like a poor use of space that could be dense housing, commercially productive, or a wonderful park.
It would be helpful to quantify "plenty dense" here. Paris has a population density of 21498/km2. Turning that around, that's roughly 46 square meters per person. That doesn't leave a whole lot of space for a potato plot if you're supposed to cook and eat those potatoes somewhere, too.