I think it’s more the case that this is an unnecessary barrier to the process.

I don’t think the issue is that someone else has touched the pack of undies, it’s that you need to go through the palaver of having someone retrieve your undies for you.

Additionally, and I know it might be a radical departure from what the internet suggests, but not everyone wants to share their underwear choices with other folks.

And I know you might think “well the cashier would see it anyway”, but surely you see the difference between someone mechanically ringing up undies in a pile of shopping, and needing to have an actual conversation about what type of underwear you intend to buy with someone?

That’s the issue.