Absolutely not, friend. I am saying that the majority of the folks who complain about SLI simply don't have patience to make it work. Most bleeding edge technologies are abandoned for this very reason. As an engineer that builds software for ML and AI, I do have the patience and enjoy the quirky challenges that SLI presents.
The tweaks that many of us deploy go very far beyond "changing the rendering mode" in NVCP. (Side note: Anything that has a fun little UI to change game critical settings is bound to cause issues.) We make changes to the SLI profile via the endless bits presented within the profile inspector, help compatibility via config files and even go so far as to edit older builds of the game to see if we can learn something new about rendering techniques.
Some of us aren't really concerned about FPS. If I can get a game that doesn't officially support SLI to utilize both cards beyond 0% I consider it a win. Often times this can achieved by turning off some lighting affects such as global illumination. (At least in the case of KCD)
Is it perfect? Nope. But we're here to learn, adapt and have a little fun.