When using image fields I frequently only need 1 size, so I must return the image as an ACF image array and get the specific size I want from the array. I cannot use “Image URL” as the return format because it only returns the full size image.
If “Image URL” is selected as the return format, there should be a dropdown to select which size to return (Full Size could be the default for backwards compatibility). Having that option would really simplify my code.