Although it is true that "time traveling" queries are relatively rare for production needs, the basic architecture supports things that many applications really need:

- It is possible to make queries against the database PLUS additional data not yet added, that is, "what if" queries

- Having a stable database-as-value is really useful for paginating results; you don't have to worry about new values being inserted into your results during execution, the way you do with traditional databases no longer how long (minutes, hours, even days) you take to traverse the data

- Reified transactions makes it possible to store extra data with each transaction, trivially, such as who made the update and why

- Immutability is amazing for caching at all layers