The benefit is primarily for Canon, not the consumer. They are a business. It's better business sense to consolidate, with all cameras using the same mount, than to have entirely different production lines for M cameras/lenses and RF cameras/lenses. That's exactly why Sony, Nikon and Pentax also use the same mounts for their APS and FF cameras. It's also one of the reasons why the M43 alliance and the L mount alliances exist. It brings manufacturing costs down and hence enables manufacturers to put more money into developing new products, paying staff and putting money in the pockets of shareholders. It's how the world works.I really don't see much benefit for the consumer to having the same mount for full-frame and APS-C
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