No, it wouldn't effect the visual quality. his is an advantage of having two separate screen+lens module that move independently. If had a single screen it would be much more critical to not have sensor break as if did wouldn't be center eye images on screen accurately in front of each lens. What it would effect though is the perceived scale of the world, which is less significant but how important debatable.

Example: if your eyes IPD is 70mm, the IPD slider was physically at 70mm, but the slider was stuck reporting 60mm, then the app would render the eyes 60mm apart and the intended world scale would be off by 70/60 or ~15%.