Hi,
the situation hasn't really changed compared to Hikashop 2, the old cartstatus view directly loaded the file cart.php and therefore also used the same file for both the cart and cart status just as it is now.
It is definitely possible and quite easy to customise show_block_cart "independently" from cart status with HS3.
All you need to use is
if(empty($this->options['status'])) {
//YOUR CODE
}
around any code that you don't want to appear in your cart status.
And vice versa use
if(!empty($this->options[ 'status' ])) for any stuff that you want to have only in your cart status.
Hope that helps.