That is an important detail.
You get the amount of STEEM depending on the price in 3.5 days. But always $1 dollar worth.
This delay is not a bug, it's a feature!
This feature does two things:
It gives you one dollar worth of Steem, which can be traded.
But also limits the possibilities for day traders to speculate on the price of SBD.
In this way, the system has a built-in robustness.
That's real innovation, from where I'm standing.