It would be ahistorical, at least: many of the Jews in 1920s Germany had fled pogroms in Ukraine and Russia just 20 or 30 years prior. Many were not particularly integrated, and only spoke Eastern Yiddish dialects.
(The Jews who were already in Germany prior were much more assimilated and less religious than their Eastern counterparts, which is why they often have more Germanic names. This appears in other forms across European Jewry, e.g. Litvaks, being more Western, typically being less religious and more assimilated than the Galitzianers.)
(The Jews who were already in Germany prior were much more assimilated and less religious than their Eastern counterparts, which is why they often have more Germanic names. This appears in other forms across European Jewry, e.g. Litvaks, being more Western, typically being less religious and more assimilated than the Galitzianers.)