If you have a multi-module build with SNAPSHOT versions and deploy it to your repository all of the modules have different time-stamps.
This is a pain when you want to refer to many of these snapshots in a different project.
Rather than being able to update a single property to reference the newly deployed version you need to make as many changes as the number of the dependencies your are using from this project. This is cumbersome and error prone.
It would be much better if all the modules where deployed with the same time-stamp if they where part of the same reactor (e.g. the start time of the reactor build and not the start time of the module build)