MP 18: Chapter 4

I believe its because as long as the person doesn't need to think and isn't ambiguous than it doesn't really bother anybody, because you rather be safe than sorry. An example is when ordering something online, you need to pick your item, your size, your color, shipping and billing address. They ask you if your shipping is the same as billing next to your spot to type in your shipping address, you can do either or it's simply not a big deal.