The main reason for the use of “Palestine” is to avoid any confusion resulting from the changing names of Hebrew kingdoms through the ancient period. For example, if I say, “Israel,” that could be interpreted as simply the area occupied by the northern ten tribes following the secession under Jeroboam. I figured the only generic terms that wouldn’t be confusing were “Palestine” and “Canaan.” Of the two, I think more people are familiar with “Palestine,” so I used that.
