I had thought that, as well. The 28-135mm would be a logical choice. But, the available kits are with the 24-105L.
There was a recent patent for an updated 28-135mm, I wonder if that was intended as the kit lens (the current 28-135 is a little long in the tooth), but they couldn't get it ready in time, whereas there's a well-established production line for the 24-105L. Plus, it serves as a 'gateway' L-series lens.





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