SHAFT (2019) 8 p.m. on HBO. This fifth installation of the “Shaft” movies unites three generations of John Shafts: two detectives-gone-rogue and one M.I.T.-educated millennial. The 2019 version finds success in its characters and their dialogues, and the depiction of John Shaft (Samuel L. Jackson) shifts from an action hero to a politically incorrect dad. The Shaft newcomer, JJ (Jessie T. Usher), essentially serves as a reminder of contemporary issues and as a catalyst for shootouts. However, “story coherence has never been the point with Shaft,” A.O. Scott reminds us in his review in The New York Times. He adds: “He’s all about presence and presentation, and the grace and guile required to deal with the bad guys, the Man and of course all those women.” Jackson — who revived the series — stars again, and Richard Roundtree — the original Shaft — returns as JJ’s great-uncle.