My rebbe Rav Belsky zt’l was a strong proponent of maintaining yekkishe minhagim; we had several bochurim in yeshiva who came from Washington heights or whose parents did, though still a small minority in the yeshiva.
At the same time, he held not to make a “yekkishe kiddush”(washing before kiddush) if one was not yekkish, as some people do for convenience.