Thank you for re-affirming that I create art. My speaking art can sometimes confuse people.I see what you are saying, if for artistic reasons you want to constrain your shutter speed to be constant throughout your production then yes of course you have to use other exposure or lighting controls. But that is not a limitation of the cameras at all nor is it in any way related to your frame rate beyond the aforementioned restriction that typically the shutter speed must be at least faster than the frame rate. That's probably why everyone is confused with what you are saying.
And thanks for the link, that explains the 2x rule as being typically the most aesthetically pleasing.