The Yekkes also had peyos. If you look at the pictures from Germany from the period of when photography was new, you’ll find completely Yekkishe Rabbonim with long twirly peyos like the Chasidim. And the Litvish wore shtreimals once upon a time in Lita itself along with a long jacket. The short jackets came about under Russian government pressure to look less Jewish and more Russian. Before that Litvaks and Chasidim didn’t dress differently.
The Chasidim simply never gave up the traditional Jewish dress. So if the Litvaks are now going back to what had been their traditional levush, all the more power to them. Beards were also universally found among Yidden of all persuasions, rabbinical and laymen. Going back to before we were forced to modernize is a positive for everybody.