You've invested a lot of pejoratives in what I've said, none of which stands up to scrutiny. The point I'm making is very simple, and I'll say it one more time so you don't think I have a dartboard with an F5 pinned to it. The F5 belonged to an era when things like a high shutter rate, autofocus and automated exposure modes were thought to be indispensable for a professional photographer. To enable those things meant a lot of battery power at a time batteries weren't as efficient or compact. That meant a disproportionately large body because unlike previous models the power source could not be detached. That will be a turn off for most amateurs today, but there'll obviously be some people who get off on the bulk alone. The F5 isn't a bad camera, but it is an incredibly large one considering it takes 35mm film. The fact you've "given no consideration whatsoever" to what I've said shines through in every post. You're a fan and fans aren't known for their objectivity.
Of course people use old cameras. My film models are 1930s designs to early 2000s and each have their merits and all are used. I don't believe most amateurs require what the F5 excelled at, but perhaps its appeal lies elsewhere.