With Glock 43X MOS, EPS Carry, and factory plate, you can see less than half the from sight with the rear drifted out. I am thinking about putting in a taller front sight and seeing how that works. I am sure it would effect POI. As the previous poster said, sights are a reference point.
The sight notch on the EPS carry is pretty small. If you leave the rear dovetail you will still have the option of adding taller backup sights later.