Oh nice rabbit trail you got there! I’m not going to follow down that trail however. Trying to equate the ten commandments and God’s Sabbath day to what the Catholic Church has done can’t be found in scripture.
That is the reasoning the Church gives, as found in the Catechism.
I don’t have time to discuss this with you anymore, anyway. I would have to instruct you on 2,000 years of Church history, and it would be pointless, since you don’t want to learn. Have fun in your ignorance ...