I would advise you, from a position of experience in the firmware field, to be cautious and guarded in broaching the issue with Fujifilm (or any other supplier for that matter). I say this, with respect, because your tone is slightly off. Suggesting that they "fix the camera", for example, is not a phrase to use with their support. The camera is working as designed. The fact that it doesn't exactly match your specs doesn't mean that it can be considered as broken.
I worked for decades as a product owner, and our change process was very rigorous, involving polling our user community for desired changes, tweaks etc. This change will not have emerged from the type of meeting room you imagine. Why do I say this? Because of experience. Often removing a function is as difficult as creating a new one. It is a non-trivial task, and will have required redesign of other elements of the package - thus there is an in-built inertia to overcome. We also as a team had to be conscious that some users might have developed a reliance on a particular function, so that too was a barrier to change.
Thus, before disabling or removing a function, we would not simply need a majority in its favour, but sound technical reasons to justify it. Since these things tend to be very intertwined, there may also have been a conflict between its mode of operation and that of a new function which was overwhelmingly demanded.
The solution generously provided (hardly a "fudge" or "workaround") seems eminently workable to me.
Any time I buy a next gen version of a product I expect to find enhancements/changes. I adapt to them. It's not an ordeal. Things may have moved, or perform differently. That's life. If you give off the vibe that it was done to annoy you, you're mistaken, and you're not recruiting support for your cause.
A final note: the most important thing for me with this camera - my sine qua non - was that it operate satisfactorily with my legacy glass. Before I bought it, I brought a mount adopter and two lenses to test with it. The salespeople were happy to let me "test drive" the camera. Maybe it would have been worth checking that it worked before purchasing if this was so important. As it is, it wasn't a trivial purchase for me, and I'd guess that I spent about six or more visits to the shop, checking that it would work for me. That process involved discovering whether I could work with it.
I'm very satisfied indeed with it.