There are actually people who think they are Catholic while deeming the Novus Ordo sacramental system invalid!
That would very clearly mean the end of the One, Holy, Catholic and Apostolic Church, contrary to the prophesy of our Lord. (Matthew 16:18).
The truth is that the discipline of the Sacraments is under the Supreme Authority of the Roman Pontiff. The texts which are approved by Him are approved in heaven and the texts that are forbidden by Him are forbidden in heaven. Catholics follow the Pope and the Books authorized by Him!
The point of Papal authority made above applies a fortiori to all of the court trappings of Christendom and the Papacy.
P.S. There is an erudite Spanish exposé on the modern demise of the courtly nature of the Papacy. Sic fugit! One ought not confuse "Christendom" with The Church of all Ages!