Lesschumras – from your last post, you clearly did not understand my posts.I already answered everything here.
Regarding Rabbinic Judaism, the Torah Sheb’al Peh was given at Har Sinai, and it is kefira to say otherwise. I am not sure if that is what you meant, but your words could be interpreted that way.
The Peyutim in the Machzorim have nothing to do with anything. The definition of Chareidi has nothing to do with Peyutim. According to that definition of Chareidi, Sephardim and Chassidim would certainly not be considered Chareidi.
Of course there are things that are done differently today. But those things have nothing to do with the definition of chareidi. That’s why even today there are many Jews who do things very differently from each other but can all still be considered Chareidi (such as Sephardim and Chassidim). According to the definition of Chareidi that both Joseph and I were using, most Jews from the time of Har Sinai until relatively recently would be considered Chareidi, despite their differences, because those differences have nothing to do with the definition of Chareidi.