Yes—the likely reason is the optical viewfinder’s inherent framing inaccuracy compared with the EVF/LCD. In OVF mode, you are not looking through the lens, so what you see is not exactly what the sensor sees. That creates parallax error and makes precise point placement less reliable, especially away from the center and at closer distances.

Because autofocus is still based on the sensor image, Fujifilm appears to limit OVF selection to fewer, more forgiving focus areas. In practice, those 25 OVF points are likely broader or spaced to allow for the mismatch between the optical finder view and the actual sensor view. By contrast, the EVF/LCD shows the sensor’s view directly, so it can support a denser 49-point grid with more accurate placement.

So while the sensor can autofocus across the same image area, the OVF overlay is the limiting factor: it cannot indicate AF position as precisely as the EVF because of parallax and the fact that it is not a true through-the-lens view.