The point is that your saddle and your bars should be adjusted separately. The first step is to position your saddle where you want it and the second step is to position your bars where you want them. If you need to adjust your reach, only do it by changing the bars, changing the stem, or getting a new bike with a different top tube length. Never move your saddle to adjust your reach, as this will throw off your saddle positioning.

There's nothing wrong with a straight seatpost instead of a setback seatpost, but these are separate issues from reach.