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As has been mentioned, ladymarmalade’s recipe is for pot roast, which is a basically a braise, not a roast. A different cut of beef is preferred for this type of roast, namely the chuck or the brisket, because, as ladymarmalade mentions, this type of “roast” gets more and more tender the longer you cook it (up to a point.) You want a cut with a lot of connective tissue. Chuck and brisket are the best for this.
Pot roast is always cooked to beyond well-done temperatures, because the meat does not fall apart and get tender before that stage. A regular roast, depending on your taste, is usually cooked to medium rare or so. The reason is you’re using two different types of meat (one with with a lot of collagen and connective tissue, another without) and the first type of meat is tough, but gets tender with more cooking, while the second type generally gets tougher with more cooking.
Why is this? Here’s the deal. Collagen-rich cuts like chuck and brisket experience a transformation that starts at around 160F-170F. (ETA: Actually, I think it technically starts at around 138-140F, but peaks or is most noticeable at around 160-170.) in the connective tissue begins turning into gelatin. If you’ve ever done a pot roast or stew, you know if you pull your meat early, it’s pretty tight and tough, even though it’s cooked through and well-done by any definition. So how can well done meat get tender with further cooking? Because of the collagen->gelatin conversion. As the tougher collage breaks down into gelatin, this gelatin also coats the meat fibers, so even though the meat is technically well done and should be dried out, the gelatin gives it a juicy mouthfeel and fall-apart-with-a-fork tenderness.
Other roasts, like tenderloin or sirloin tip, for instance, have very little collagen and never reach a stage where cooking more will cause them to get more tender. The trick with these roasts, though, is to select meat that is well-marbled, which is at least of choice grade. (Dry) roasting is a method that is not as forgiving to inferior cuts of meat as pot roasting is.
Now, yes, there are some cuts that work well either in a braise or a roast. But those are the general guidelines. Lots of collagen -> braise. Less collagen -> roast. Also, the two cooking methods yield very different flavors and textures. I love both and, to be honest, I do more braising than roasting most of the time (it’s cheaper and easier), but if I’m expecting a roast and get a pot roast, I can’t say I wouldn’t be a little disappointed.