Sorry, I don't agree. That's part of the philosophy most airlines follow that the F/O is just a Capt in training. You send the pilots (both CA's and F/O's) to school and you teach them.
At TWA (and I'm sure most of the others) if it was the F/O's leg (so he would be doing the PA's) and it got bumpy HE would make the PA and turn on the seat belt sign. Of course usually you might comment: "Hey, I'm going to seat them". CRM and all that.
As far as F/O's not like making PA's; that is part of preparing to upgrade some day! One less thing to get used to doing when you go to Captain school. Yes, if your company has a culture where the left seater does most of the PA's then yes, it would not be routine for the F/O. Again at my old airline it was normal for the F/O to make the PA's on his leg and we knew how to do it right. When you went to CA school it was a non-event.