Yes, great strides were made over the period - over the whole period, not just the early part of it. And those strides were not made cohesively, or by one person, or that anyone was doing good concerted gathering of data from the gaming public. Steps were made hither and yon over teh course of a decade, and it took a great deal of time to learn which of the steps were good ones, and which were not.
So, I'm not really sure that they would have been ready to make a decent 3E much sooner than they did. Nothing would have been served by putting a new edition out sooner if that edition stank like a pile of rotting hyena livers.