Walmart ground meat is the worst of all, IMO. Their ground beef sometimes loses almost half is original size after cooking.
Now 80-20 has quite a bit of fat which I want for a good burger but when I brown it and break it up, it often lets off little to no fat (if there is any I tip the pan and spoon it off or sop it up with paper towel(s)). But if I then slow cook it, fat creeps out and there's that orange grease after refrigerating. I try to scrape out as much as I can.
I think my burgers shrink some and I don't want that so you make a good point.
Maybe my taste is off in my older years but I remember getting ground beef, frying it in a patty and eating it as a steak burger with no bun. It was so tasty then. I liked it with a little bite of raw onion, maybe some Worcestershire (which I don't llike much in cooking), A-1 steak sauce I haven't bought in years, or just plain.
I had some roast a few years back and was so delicious I couldn't believe it. It was bought directly from a farmer. But they could have used prime rib and cooked it like a pot roast. Whatever, I wish I could buy a half of beef but I wouldn't use it up fast enough.