You discuss practice and not doctrine. It is not possible to change doctrine.
There is no problem with the Inquisition or the Crusades - both are very defensible if you would like to discuss those (just seems a side argument at the moment).
If you can show me any document where the Church said that Pedophilia was moral and licit I would entertain the discussion that the Church has changed its doctrine. If you want to say that the Church changed the way that it punishes priests who broke their vow of celibacy with underage youth that is a different discussion.
The Church has changed practice on certain things many times. Take the Eucharist. The manner of reception of the Eucharist by the faithful has changed over the years. From what I understand, there was an early heresy that stated that the people could receive the body, but only the Priest was worthy to receive the blood. So the Church said everyone should receive both. Then there was another heresy that stated that unless you receive both you have not received communion. So the Church said that everyone is only going to receive the body to show that the fullness of the Eucharist is fully present in both the Body and the Blood. These days the blood is being made available to the faithful again. No change in doctrine about what the Eucharist is and the necessity of receiving it, but a change in the manner of reception in order to teach the truth of the faith.
Ceremonial vestments are just that - ceremonial vestments. They have a reason to exist and craftsmanship and materials change through time resulting in changes to them - just like the style of suits changes over time. The ceremonial/formal wear remains fundamentally the same even though the style changes. Those of course mean nothing to the doctrine being preached. Organic growth has always been an aspect of Christianity - it is evidenced in the Acts of the Apostles.
Ummm... you are making a case against yourself by mentioning the succession of Judas.
“Therefore it is necessary that of the men who have accompanied us all the time that the Lord Jesus went in and out among us— beginning with the baptism of John until the day that He was taken up from us—one of these must become a witness with us of His resurrection.” So they put forward two men, Joseph called Barsabbas (who was also called Justus), and Matthias. - Acts 1:21-23
So the Aposltes who had traveled with Jesus understood that it was necessary to promote somebody into a leadership position. They also understood that it was only men whose names were to be put forward. Jesus had explicitly given them authority. So it would seem that your entire point has failed.
One's personal holiness does not mean the right to be a priest. As previously mentioned, Catholics consider nobody more Holy than Mary - that doesn't change eligibility for priesthood because the role that the priest fulfills is reserved for men. The priest stands in Persona Christi and not as himself. As Jesus Himself said that He's the Bridegroom it requires a man to stand in his place. Catholics hope that they are given a Holy Pope to lead them, they don't believe that the Pope is necessarily the most saintly person alive.