Reply To: On What Siddur is the Artscroll Based?

The question was never about the origins of Nusach Ashkenaz. There are many different directions a siddur could go with Nusach Ashkenaz as there are many yesh omrim’s in the classic Ashkenazi poskim. The question is how Artscroll makes those decisions.

The question of how they did Nusach Sphard is arguably even bigger. Which Chassidus did they go by?