Carjacking relies on burner cars; they drive up near victims, 2 people get out and rush the car, and then both cars speed off. Carjackers (at least in Chicagoland) don't generally post up in parking lots waiting for victims; they're highly mobile.

(I have two carjackings on camera from behind my old house, where we had a Nest camera. One thing I learned from that: anybody who thinks carrying a firearm is a realistic defense against a carjacking is in fantasyland. You don't get even a split second to react; the encounter begins with a gun in your face.)

No-chase is absolutely the right policy for a dense urban area. Every once in awhile where I live we get trustee candidates promising to bring chases back, and I have to wonder what they're smoking.