I agree. Higher intensity (not max'd out or anything) is better than low intensity, all things being equal.
But the reason I do low intensity is to take it easy on my joints. Especially knees and hips, which are totally fucked from playing football my whole life. I guess if I hadn't, I could run now. But, I played football. I made my choice. Now I pay for it.
Also, I never get below 225, and have gone as high as 275. Running at that weight is never a healthy thing once you're in your 30's. You're just asking for a blown achilles or some knee cartilage fuck ups.
But if I wasn't a bag of arthritis, damn right I'd be running. I loved sprinting and running when I could do it as a young man with pads and helmet on. You felt like a machine capable of crushing anything. Awesome feeling. I miss it.