My suspicion is that you would see similar improvement with things like waist circumference, BMI, blood pressure, at least initially, but that the difference with intermittent fasting is that it introduces enough of a "fasted state" that the body is able to perform repair and autophagy of senescent cells that would occur much less in a constantly fed state. (something about telomerase, but I probably shouldn't mention that because my memory about that is foggy)

If you increased the amount of fasting, I'd bet good money that people would lose more weight than on a calorie-equivalent diet. Intermittent fasting, in my experience, is helpful in sticking to a diet that is lower in calories because it allows you to eat satisfying meals.