RE 1), I didn't mean that LEDs themselves would break down (unless soldered badly). But their controllers, or power converters, just might. Like with LED lightbulbs - most of them break very quickly due to cheap power & control components and/or bad soldering job causing thermal damage.

RE 2), fair. In my mind, I grouped vertical and rooftop farming together, and find them desirable in the sense of bringing back more plant life into the cities (and reducing last-mile transportation footprint). But you're right, in terms of general food production, they're not all that interesting or useful.