Some FO's are just as good and better than some captains. Some captains are just as good and better than some FO's.
Being captain does not mean the more experienced pilot is in the left seat. It means the more senior pilot is in the left seat. I've known great FO's, I've known weak FO's. I've known great captains, I've known weak captains.
I'm a right seat gray beard and have a lot more experience than most captains I fly with. The vast majority of the guys I crew with recognize and appreciate that, some do not.
My point is that most FO's have the same ability as the captain. My airline does not hire FO's, they hire captains. You get my drift.
By the way, the right seat makes me look 30 years younger. I don't even have to dye my hair.