Avira – what has changed is that no one is relying on the Chazarah to be Yotzei. We continue it because it is the Tzurah of Tefilah as determined by Chazal, but since no one needs it to be Yotzei it is not the main SH”E of the Sha”tz.
IsraeliYid – this is for a different reason. One must Daven anything said out loud in the Nusach of the Tzibbur. Therefore, if one is not conversant, he must “practice” in the Shtiller SH”E. If one is, say, equally conversant in both Ashkenaz and Sefard, then he may Daven Ashkenaz in his Shtiller SH”E even though he is Davening for the Amud in a Shteibel that is Makpid on Nusach Sefard for the Chazarah (example taken from my own life, based on another Shailah I asked!).
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