LED Forward Current vs Forward Voltage

LEDs are current driven. Of course different LEDs will give different intensities and/or color temperature even when driven by the same current (e.g. series connected). This is where binning plays a role, but binning is is done for brightness/color temperature vs. current. Not for voltage.

The graph voltage vs. current usually shows the typical curve, possibly best and worst case, too. This graph can be used to calculate e.g. a series resistor or the voltage drop when using a constant current source. You'll have to live with the uncertainty in voltage drop resulting from this procedure.
Note that voltage drop vs. current depends also on temperature and age of the LED.

For applications where the exact LED current is not that much relevant, use the typical voltage drop from the graph at the desired current to calculate the series resistor. Simply accept that this current has a comparatively high tolerance due to the effects described above.
For applications where LED current needs to be exact, use a current source. The voltage drop at the set current is only an indicator required to determine the necessary compliance voltage of the current source in this application. It doesn't have to be exact. You'll have to leave some headroom (reserve) in voltage anyway to account for variations in voltage drop due to the effects mentioned above.

As a note on the side: reading a value from a datasheet's graphed curves to better than 10 % is imho a challenge anyway.