There are a few modules using shift registers, one of them being the famous Benjolin (https://www.modulargrid.net/e/epoch-modular-benjolin). Other modules using shift registers: https://www.modulargrid.net/e/modules/browser?SearchName=register&SearchVendor=&SearchFunction=&SearchSecondaryfunction=&SearchTe=&SearchTemethod=max&SearchBuildtype=b&SearchMarketplace=&SearchIsmodeled=&SearchShowothers=1&SearchShow1u=&order=newest
Do you use a module with shift registers? Why? Do you even care? Just wondering...