It comes down to logistics. Maybe I'm a smaller restaurant, and I want to serve BBQ or fresh bread. Might not be feasible for them to smoke a brisket every day if they're not a brisket place, but you can definitely freeze some brisket and bring it back to life in pretty good quality. It doesn't improve it, but it lets a restaurant serve something that they otherwise couldn't.

Same goes for fresh bread. Maybe they want to serve pastrami sandwiches in Manhattan, but the best rye bread they can find is in Detroit, and so they have their baker freeze the bread and ship it over. It's not that the bread is better because it was frozen, but they're able to get better bread because they could freeze it.

Yes, these are examples of people maximizing for a variable other than quality. The linked study indicates that the freeze-thaw cycle has significant negative effects on the quality of ground beef. I believe ground meat is probably more damaged by freeze-thaw than whole cuts of meat.

https://www.dti.dk/_/media/66980_Effect%20of%20packaging,%20... (PDF!)

The methodology used for that paper makes it irrelevant for a discussion of optimizing the quality of frozen items——the packaging, the cooked burger doneness (167F), and the fat percentage are all significantly different from what would be used in a high-end commercial setting. I've been saying that a great burger could be cooked with a frozen patty (and you could even freeze the bun as long as you don't freeze them together), not that the freezing itself improves the quality of the meat for typical burger metrics of quality (with the exception of crust formation, which could be much better potentially if cooked from frozen).

Freezing food has a stigma that it doesn't deserve if the freezing and thawing is done with care. As I mentioned before, the best sushi restaurants in Manhattan all freeze their fish and store it in extremely cold freezers, and there's no significant detriment to quality. If Shake Shack wanted to do so, they could freeze their patties, and they'd still have one of the best restaurant burgers out there. They certainly would not be freezing their meat in the way that was done in that burger paper, nor would they be using meat of that quality.

You definitely cannot freeze cooked barbecue brisket and bring it back to life at adequate commercial quality. You can freeze raw brisket, but that doesn't solve the core problem of serving barbecue brisket, which is that it takes so long to cook that you have to either be really good at predicting your turnover or close up early when you run out.

Long story short: freezing brisket, not a great plan.

You certainly can freeze barbecued brisket and bring it back to life in great shape——I've done it plenty of times. It took a lot of trial and error, but it's not impossible. I'm not cooking a 18 hour brisket just to eat a quarter pound of it and toss the rest.