The Steelers managed to sign T.J. Watt to an extension before training camp, which is good news on multiple fronts. While it avoids the potential drama a hold-in (or even a holdout) would bring, it has a more practical benefit. Both he and the coaches expressed a desire to make changes to his schematic usage. Now he has all of training camp to actually work on it, rather than just talk about it.
During Watt’s last contract talks with the Steelers, he showed up to training camp but did not participate in practice. At the time, he didn’t really have anything concrete he needed to work on within the framework of the defense.