Checkbox SHIPPING_ADDRESS_SAME default is unchecked

In most cases the customer and the shipping addresses are the same. So, I think, this checkbox should be checked by default. Do I miss a configuration option?

A first look at the php-code seems to do so:
<label class="checkbox"><input type="checkbox" value="1" name="shipping_address"><?php echo JText::_('ESHOP_SHIPPING_ADDRESS_SAME'); ?></label>

I don't understand why it finally displays unchecked.

Thank you for your input.

Dear Patrick Droz,

EShop is designed to work like that. Customers must tick on that address box to make sure that they are aware about same address at step 3 so step 3 will be ignored if they tick on that checkbox.

I think that it should work like that. It's better than making it to be selected by default.

Sincerely, Giang