Is anyone else mildly disappointed that the project won't feature natural grass?

If plants can thrive in an arboretum, can't grass do the same? It's my understanding that the roof will be clear and let in a ton of natural light.

forums.gardenweb.com/discussions/1617384/growing-grass-in-a-greenhouse

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"I did not invent the head slap, but Rembrandt didn’t invent painting either."
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