rationalfrummie: There’s a general klal (or so I’ve learned) that rabbanim can argue with others of the same do but not with those of previous doros, probably due to the whole principle of yeridas hadoros. Note that all your examples are of rabbanim and poskim of the same tekufah.
Actually, I don’t mean dor as in generation, but rather as in, like I said, a tekufah. An acharon can’t argue with a baal Tosafos, and a baal Tosafos can’t argue with Chazal, but the baal Tosafos can argue with another baal Tosafos.
If this isn’t true, tell that to my halacha rebbe- he tested us on this.