In version 3, Service Center would show the last published date of every version. Since version 4, this information is no longer available, and you can only see the uploaded date.
Imagine the following cenario:
You have 5 (v1- v5) versions of the same eSpace and the running version is v4
You publish a new one (v6)
You test the application and something is not how it wassuppose to be
You decide to rollback and publish the previous version, but you end up publishing v5 instead of v4.