I agree it doesn't seem super useful, but it can be used to pull some semantic tricks. I used it in [Rebridge](https://github.com/CapacitorSet/rebridge/) to implement syntactic sugar for database access, so that accessing a property on an object translates transparently to a query, and I've seen it used to [allow for typos in property names](https://github.com/mathiasbynens/tpyo).