Ergonomics is a cargo cult.
In the case of cameras it’s role is blown vastly out of proportion.
Very few users, even press people, use cameras so much that anything but masochistic layout would ever even challenge, or slow you down.
As with any interface, what you are used to is what is mostly what is ergonomic or “correct”.
When ergonomics really matter is when complex and/or complicated tasks has to be done repeatedly hundreds or thousands of times a day. And done with precision at the peril of life and large sums of money.
Ford assembly lines and cockpit designers where famously some of the first to do extensive research in ergonomics or human factors.
Any layout that isn’t completely stupid and counter productive, and lets you form a mental model, will become “ergonomic” over roughly the same period.