I think her point is to provide a sector / factor ETF for money managers looking for a simple way to add exposure. No money manager in their right mind would hold ARKK as a large percentage of a portfolio, but it's been useful for gaining exposure in "risk on" environments. I've never her heard her describe it as a "diversified" solution. It's in my toolbox as a future shortcut when I sense I turn in those type of names. 

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