Sorry, I am not sure about what you are commenting on. Is it the design of the RF 100-500m? If Canon deliberately hog-tied its TC capabilities for market segmentation, then I am not impressed. If they did it to optimise optical quality, then I wish they would explain so.Why else make them that way? They could have made the barrel longer in front, putting it even with the extended optics.
For EF, ‘official’ compatibility was restricted to L lenses 135mm or longer. When the 70-300L came out, it was listed as incompatible with the extenders, but that changed ‘officially’ with the 1D X firmware update that enabled f/8 AF, when the 1.4x was listed as compatible (even though it was not reported to the body, since the lens lacks the three extra pinouts).
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