APS-C is a strange sensor format. Derived from the dimensions of the short-lived Advanced Photo System film negative, it emerged as the dominant format in the early days of the DSLR revolution largely because for many years, full-frame digital sensors weren’t a practical option in consumer-level cameras. Canon used the even more obscure APS-H format for a few generations of its sports-oriented EOS-1D series, but by 2012, full-frame was solidly (re)established as the ‘professional’ format for both of two biggest D/SLR manufacturers.
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https://www.dpreview.com/opinion/4178727265/what-the-z50-tells-us-about-nikon-s-aps-c-strategy