I have a feeling we are not talking about the same thing. Just to be clear, so what you are saying is that the aperture ring on the lens (like what it used to be 30 years ago) can say I'm on F8, but really I can be on F4 because I'm in P mode, correct?
There are two types of aperture rings, those with f/stop markings, the 35mm for example, and those without markings, the 18-55 for example. A third type of lens, the XC models have no aperture rings.
The aperture rings are not mechanically coupled, so the aperture setting CAN be different than what is shown on the type of ring with markings. Same for shutter speed and ISO for that matter. This behavior is not the same for all Fujifilm bodies.
The X-M1 has a mode dial and when it is set to P, S, M or the auto modes, the aperture is set by the body independent of the physical setting on the aperture ring. The aperture ring does not have to be on A(uto).
On the X-E2 and X-T1 (the only ones I have experience with) there is no mode dial, though the camera has the P, A, S and M modes and calls them that, they are inferred by how the aperture ring, aperture switch and the shutter speed dial is set. On XC lenses, the lenses is put into auto my moving the aperture setting past the highest possible setting.
So, on the X-T1 and X-E2 an aperture ring with markings WILL show the aperture and on the X-M1 is will not show it unless by coincidence.
But, there is an exception, the remote camera app can control the aperture, shutter speed and ISO and the settings can all be different than what they physically indicate.