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:incense:https://youtu.be/qlBrsqqUsuI 1:40 part. Was the Mass “unclean” before Pius X?

Okay, once again, someone help me out here...

What, exactly, did Pope St Pius X do, to "purify" the Mass?  What changes did he make?  My assumption would just be "none".

If he called for greater participation --- as he said, "pray the Mass" --- that is not a "change" in the Mass itself.  I know there are various schools of thought on the desirability of a "Dialogue Mass", but I don't think that Latin responses, such as the altar servers make, are beyond the abilities of anyone with proper priorities who has a hand missal in front of them.  (When I served the TLM a couple of decades ago, I always had to keep one of those little "cheat cards" in my hand, after all, the priest isn't required to memorize his part, why should the server be?)  That is not terribly difficult Latin.  People learn how to do various jobs, play sports, drive cars, cook from recipes, do math, learn basic historical and geographical facts, knowing the basics of the TLM shouldn't be any different.  It's all about priorities.

St. Pius X made no substatial changes.  He did reform the Breviary and the calendar a bit.  It is true that sometimes over time, things get added to the Mass in an accidental way, such as Feasts being added, saints being canonized, etc., and with all the added stuff over time, there may be a need to "clean up" ... which is probably what +Fellay was thinking, perhaps unable to find the right English word (as Enlighs is not his first language).

So then he says that St. Pius X set the Mass back to what it was in the Middle Ages ... except I think that most would say that St. Pius V was POST "Middle Ages" ... and of course he makes no mention of the Pius XII Holy Week Rites and the John XXIII accretion to the Canon.  So, no, the Holy Week Rights and the Roncallian Canon do NOT reflect the Mass that was being offered in the Middle Ages.