theburningmonk
commented
11 years ago e.g. when you want to change timeouts on an activity, you couldn't just deprecate the activity version, because I don't want to expose activity versions explicitly, the workflow as a whole should be a 'value' and therefore changing any part of it should require changing the version of the workflow which will create a new version for each of its activities and hence allow both configurations of workflows to continue concurrently.
This makes it easier to change the registration of an existing activity by changing the version at the workflow level