Especially in the case of diets, I think personal experience should acccount for most of how you make your decisions. The human body is very flexible to different conditions, the science here is pretty flaky, that trying to make sense of diets by using logic only helps very little. Anyway I'm just repeating what you're saying, that personal experience may not be universal but it's important for yourself.
I'm not saying my personal experience should be considered universal, that'd be foolish. Just recounting that.
But it makes sense given how metabolizing fat and metabolizing sugar works. Insulin response, etc.