My brother was a franchise manager for Arby's, running three stores (including one of the 20 oldest locations) for about 15 years, so by second hand osmosis I learned quite a bit about the nuts and bolts and politics of the chain.
Arby's did originally stand for, "America's Roast Beef, Yes Sir!"
Ever since the 1960s they've been carrying on an internal battle between capitalizing on the "roast beef" angle, trying to be the best roast beef joint they can be, and trying to diversify, writing off "roast beef," and spreading out into other food categories.
Thus they swing back and forth between high emphasis on "Yankee Pot Roast," "Au Jus Beef," "BBQ Supreme," Kings, Supers, Big Montana's, etc etc, and then swinging back to chicken, turkey, and "deli sandwiches."
Problem is, their stockholder base has become so diverse and diluted (I think now, of course, they're owned by equity funds) that no one faction ever established as the "leadership" of the company, which results in wild changes in organizational direction from year to year.
Functionally since the start, Arby's biggest problem has always been that their trademark/namesake roast beef comes in 12-pound chubs of processed meat (I may be off on the exact weight) which must be pre cooked for several hours, and then sliced for SANDWICHES!
Although they've gotten better at it over the years, there's just really no way around the fact that in any given chub, 20-30 percent of it will be dry, stringy and tough.
So if you get a sandwich made of the inner 70-80 percent, it's yummy and juicy and you think Arby's is the bomb. If you get the 20-30 percent of chewy leathery quasi-jerky, you wanna go to Subway, or swear off roast beef completely for a decade or two.