1st things 1st:- There are 12 Gates to Shomayim, for our prayers to most effectively soar up to haShem. In-fact if someone barks up the wrong gate:- i.e. Davens the wrong Nussach as per his/her family custom, his/her prayers may possibly not reach haShem.
My arithmetic tells me that 12 Gates is 6 times as many as Hassidik & Litvak exclusively.
Let me make 2 observations:- 1) Yekkes are Not Litvaks, and despite both praying Nusach Ashkenaz, let me tell you in no uncertain terms:- Plenty differences in both sets of prayers.
2) I have not read 1 remark about Sephardim on this forum:- What happened to our dear Sephardim brethren? Yet many wonderful marriages between Sephardim & Ashkenazim.