[ R M ]
Still cameras for capturing still images have for a long time depended on the manual dexterity and flexibility of human hands. They were not really designed to be "easy-to-hold, easy-to-position," and did not fit in the user's palm.
[ Cinezoom512 ]
Movie cameras made an earlier start in the development for being easier to hold, given the nature of their vital importance to secure steady holding for a certain time while shooting motion pictures.