Do we have to listen to the Pope?

[Missbeliever]

His reform of the Breviary, radically changing the traditional Psalter, also opened the way for the later reforms, ....

When St Pius V promulgated the Tridentine Breviary, he affixed an Apostolic Constitution, similar to Quo primum, called Quod a nobis, to it (which unfortunately, I can't find online). It used the same sort of language, threatening dire punishment to anyone who would alter what he was promulgating. I have never heard of any Traditionalist arguing that St Pius X was a destroyer of the Liturgy because he 'violated' Quod a nobis as they do about Paul VI 'violating' Quo primum.

Ohh lost...so lost here! Have no idea what all this is!