As an american who shops and walks my groceries home like a european, the self checkout is the only option for me. I must have the ability to choose where to put products to keep my bags/backpack balanced to my liking and to prevent bags from failing on my walk home. Stranglely in the us, i risk approaching the "self checkout item limit" which is definitely more social expectation than actually enforced by staff.
A more specific question for you: how often do you encounter scales on self checkouts?