Is there really no reason not to grow foods - is this a researched opinion of yours or just conjecture?  The last article posted on HN about the trend of rendering skyscraper designs with greenery noted many of the problems with actually building them (irrigation, water proofing, the ability to support the extra weight of the soil&#x2F;plants, sunlight&#x2F;shadows, high winds, etc), I would imagine the problem being even greater if you had to grow edible foods rather than just a green plant.