[muawiyah]

Do you want to get mail or stuff? The letter carriers simply can't be bothered with "stuff" in the way, or be accused of stealing it if it gets messed up when the mail is deposited.

[Spktyr]

Really? So, what you’re saying is that that giant rotary drum is going to be clogged with ‘stuff’ all the time and therefore letter carriers can’t be bothered to check it?

Oh, wait, that’s what happens to those drums at the post office, because half the people who are supposed to be working are on break, and the other half can’t be arsed to deal with it.

Banks, however, don’t seem to have a problem with it. Neither do most other places that use them.