Wrong!
A common misconception about flash is that its purpose is to "brighten up" a scene with low light. Hence, some will speculate that with the amazing high ISO capabilities of modern digital cameras, maybe flash units aren't so necessary anymore.
Well, take a look at the image on the left. The woman was standing under a recessed ceiling fixture. To add insult to injury, the lamp was a compact fluorescent. The position and direction of the light was most unflattering, with the putrid green fluorescent color to boot.
No super-duper high ISO camera will make that light better. Your big, expensive, fast prime lens will be powerless to improve the situation. You can only improve it with lighting.
The image on the right was lit with a flash unit on a bracket with a Lumiquest Softbox. Not the greatest light to be sure, but the best practical solution for the situation (the ceiling was high and black). As much as we cringe at the thought of being forced to use direct flash, it's often a whole lot better than nothing.

Glad to see I was wrong.

