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Originally Posted by flake
There is a good reason for changing the grip in this case. Many times the dimensions of the camera changes, so the old grip physically won't fit,
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That's not necessarily a valid reason. They could have still built it in such a way that the other grip would fit.
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but in the case of the 7D Canon upgraded the weather sealing,
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Again, that shouldn't preclude owners of the other grip from using it. It's a feature that has no bearing on the layout of the grip. It's an incentive to upgrade for some, but for those without the budget they could still have been accommodated if they'd chosen to.
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especially following the weakness of the battery grip on the 5D MkII. So perhaps that's reason enough? Or maybe you would prefer that progress wasn't made so old equipment can be reused?
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Progress shouldn't preclude the matching up of a couple of bits of metal or plastic. The dimensions of the camera base could have been laid out to match the old style grip easily enough. In fact, if the fittings of the 10D's grip were to suitably align with a 40D then it would fit better that the 40D's grip which has an indentation on one side when attached. And, in terms of what matters here, when matching physical characteristics rather than advancements in function, the BG-ED3 was a better design than the BG-E2N.
Personally, I think with the BG-E2N there were valid reasons for me to make the choice to upgrade, if I was given the choice to (despite its inferior ergonomics). But unless there is drastic restructuring of the internals of the camera bodies from one model to the next, or in the electronics that required the grips to be different and the layout was changed to prevent use of the old grip, there surely could have been ways to make either work, and to leave the upgrade choice to the consumer.