Elk are indeed tough, which makes it dangerous to judge people based on partial information from a recovered animal with previous wounds or animals that don't drop stone dead from the first shot.
The first elk I shot with a rifle was at medium/long range, and he took 3 rounds through the vitals with a magnum round beginning with "3" and showed no reaction until the 3rd one. Even then he walked off and stayed on his feet for several more minutes, hacking blood all over the side of the mountain. The only way to shoot him better would have been i the heart or break the shoulder structure. I was deliberate in not shooting for the shoulder as I valued the meat.
I will say, before witnessing it (and having another witness there), neither one of us would have imagined such a thing was possible. But we witnessed it and conducted the post-mortem. Yet I've gotten the keyboard commando reaction to the hunt based on assumptions about how things SHOULD go.
It's easy to criticize people based off partial information. Use enough gun, give yourself every advantage to stack things in your favor, and use some understanding i judging the outcome of others' hunts.