There are examples in the past where, for example, Sigma EF mount lens would stop working properly when Canon changed their camera firmware. So, Sigma and Tamron introduced docks so that the lens firmware could be upgraded.Licensing is more complicated than you might think when you add in the support angle. If you buy a "licensed" Chinese lens for RF mount and the Chinese manufacturer offers no support, then the support call will go to Canon, who will be expected to somehow magically make the Chinese lens work. Canon has so far only licensed manufacturers who have decent support in their own right and I suspect that will be the case in the future. A manual focus lens from 7artisans is one thing. An AF lens with all the software support to deal with CA, distortion, etc. is quite another.
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