Err they do if you order online for collection - their staff pick your order and bring it out to you. You just park in a bay, check in and someone brings your shit.

Granted they, generally, don't carry your shit from the checkout to your car if you do the shopping...

Way back when full serve gasoline was a thing, and I can currently go to at least one of the big hardware shops here and get a hand loading if it's a lot of stuff or particularly large items. Airlines used to serve steak and flying was treated as a more formal affair.

The overarching point is that as thing go on shops and services have continued this trend of getting more transactional in their handling. There's much more of a 'give me your money and GTFO' than it was. This come a lot from the dominance of places like Walmart killing off competition so you're left with a 'where else can you go' situation.