Don't take Jett if all you are going to do is op, there is chamber for that. don't take jett if you don't know what smoke and dash is. don't take jett if you are going to op on attack.
Okay, so even if jett was better at oping on attack; chamber is still more suited for oping on attack due to his kit and overall utility in a team (TP, and he is sentinel so he is automatically tasked with holding angles and lurking so that his trips will stay up so his team doesnt get bit in the ass.) It would make more sense to have chamber oping since he's already going to be holding angles on attack whilst jett dashes into sites to help the team take them. Also there's only going to be one more duelist at most in ranked lmfao.