Basically a time machine would need some innate way of sensing when it is. Normally we tell time using clocks, but a clock only tells you how much time you've moved through since the last known point.
It's rather like sailing on the ocean before the days of GPS. You would leave port, and measure the speed at which you traveled, and a chart would tell you where you should be based on traveling at that speed. Without a landmark you never have a way of knowing where you are. If you were wrong about your speed then you could be hundreds of miles off course.
Time doesn't offer us any known landmarks. So it seems Dr. Brown's greater achievement than the flux capasitor was some discovery that allowed the DeLorean to know when it had to stop.
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