Chia still needs to answer exactly what data they're storing in these plots, what percentage of the storage in their network is being utilized, why they want an exabyte-scale storage array, and why storing tiny slivers of files requires drives to be constantly rewriting hundreds of terrabytes worth of data. Is all this storage being used for personal projects, or are they going to start renting it out to Enterprise/Countries/Dark Web?
Of course, the short answer is they probably don't care about how much wear is burned into all of their unlimited free storage. Odds are the devs are going to bail once they've built enough confidence in their scheme that their "strategic reserve" of free coins makes them all billionaires. They aren't going to explain the plan, because exposing that level of cynical supervillainry will surely inhibit their ability to take people's money.