“Or as you put it (And I whole heartedly agree)
So it’s not necessarily about the ideology being different but about the situation being different. The same ideology calls for different responses to different situations.
This is true for every change that takes place including mass kollel, maintaing a certain levush, Zionism etc
Which is why it is silly to say charedisim is the “default” and all other streams are changes.”
The point is that Chareidim are called Chareidim because of the ideology, and the ideology is not new. Those that wish to say that Chareidi’ism is a new thing are trying to say that the ideology is new.