my friend told me to ditch rear delt flys as they are made redundant by face pulls. He said that rear delt flys only hit rear delts and mid/lower traps whereas face pulls (done on lower cables like the seated row machine) hit all those muscles as well + upper traps and medial delts.
Is there any truth to this? He tried explaining it but I still dont really understand how upper traps and medial delts are involved.
I didn’t find the right solution from the Internet.