I'd like to think that anyone who cares enough about photographic equipment to use a digital camera in a format "35mm" or bigger, and to debate focal length equivalents and DR and resolution and high ISO speed performance and DXO scores, could easily handle actual sensor dimensions in mm – so-called digital medium format now has two main formats: 44x33 and 54x40.
But apparently, the mob tendency is to shoe-horn new formats into old names, including using an obscure, failed and obsolete film format (APS-C) to inaccurately describe the dominat DSLR formats, while bizarrely, the best-known still photography format name, "35mm" has been abandoned!