Replying here because of nesting limit.
I acknowledge that SBD comes with risks. Bittrex and Poloniex using hot active keys on accounts that hold millions of STEEM is also a great risk, but it's one that has been tolerated so far. Furthermore, SBD risk mitigation has been baked into Steem.
I'd say SBD has been a selling point, driving some investment in the idea of Steem in general, and in Steem Power. At least it was for me.
It's hard enough to get people --even bitcoiners-- to use BTC in commerce, let alone newer blockchain tokens. SBDs are much more familiar units of trade than a STEEM token to any American and probably Europeans who use units of similar value. Using STEEM will add complexity to the user experience because if they want to transact, they'll have to first convert the value of STEEM to a value they're more familiar with. SBD jumps that hurdle.