My uncle swore by a 3-hour rest for brisket, I called BS until I tried it on my last cook

Oh absolutely, it's a total game changer. I used to just let it sit for an hour and thought that was enough, but after trying a long rest like kim373 mentioned, I'm convinced. That extra time lets all the heat and juices spread out evenly so every single bite is good. It turns a decent brisket into something you can't stop eating.