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So a couple threads back, we had a conversation about why most photographers tend to stick with JUST Canon or JUST Nikon cameras, and one of the main points for this was that it's easier to just stick with one system instead of learning where a completely new set of buttons are on a different body.
However, I've found that this is not really a valid argument for people who periodically upgrade their bodies. Nikon and Pentax are especially guilty of this, but Canon changes up the rear button layout seemingly with every single generational update.
I remember upgrading from the Pentax K-5 IIs to the K-3 and really struggling to get used to having an AF focus mode and focus area vs. point button moved to the front of the camera by the lens (hold while turning either of the two command dials), but the actual focus point selection toggle was on the rear of the camera, and the way it functioned was different from every other button (press to toggle on AF point selection mode, use the four way control buttons as an AF point selector, then press again to toggle off AF point selection mode). So illogical and unintuitive. The K-5's AF focus point control, by contrast, was so intuitive and perfect. You could understand it just by looking at it.
Why are camera manufacturers constantly trying to fuck with their most loyal users who upgrade bodies? What's in it for them?