You can also make pot roast from leaner meat. Just don't buy meat that is labelled for pot roast.The fat in the pot roast that I was referring to was in the meat! I'd take a bite and have a full mouthful of fat. Yuck. I froze most of it. I discovered I don't like pot roast that much after all. Probably will never make it again.
Personally, I don't mind the fat, but DH doesn't like it. I even eat around gristle, but again, DH dislikes coming across it. So, I generally don't make pot roast from shoulder / chuck. It's too much work cutting out all the larger bits of fat and all the gristle.