If it actually enjoyed it, sure. But I believe it would be a substantial lowering of their quality of life. Seeing the difference between how happy my cats are with their normal food vs wet cat food vs churu treats, it's plain as day they have preferences. While they can survive with proper nutrients, they won't have as fulfilling a life by limiting their food source in such a manner.
I won't talk about what's natural since my cats aren't catching any salmon or taking down a cow on their own, but I'm not getting a pet just to enforce a restrictive diet on them.
You are certainly neither. If it was easy to solve, it would already be done. I believe it's feasable with today's techniques with imitation meat but at a huge cost.
The reality is that most pet food utilizes what would otherwise become food waste. It may be difficult to replace it in a way that isn't a net negative.
That's the thing. I don't need to be, because I'm not suggesting a diet shift away from established practices offered BY vets. You, however, are attempting to escew established norms in favor of your own agenda. As they say, "Fantastic claims require fantastic evidence."