This is a criticism of the Amazon page more than of the product. It seems that most (all?) of the reviews are labeled as being for the various Pi 2 kits, but are in fact for earlier versions of the kits (Pi B and Pi B+) which had different kit components. The Base kit used to contain a case apparently so there are reviews labeled "Basic Pi 2 Kit" discussing the case and I was expecting a case when the Basic kit arrived.
If you sleep in the same room as your baby or live in a small enough space that you can always hear or see what your baby is up to, you probably don’t need a monitor. Otherwise, most parents enjoy the convenience a baby monitor provides—instead of needing to stay close to the nursery or constantly checking on your child, you’re free to rest, catch up on Netflix or get things done around the house during naptime. Monitors can also double as a nanny cam to keep an eye on your child and their caretaker.