In which scenario it might be necessary to schedule the Snapshot Agent for Transactional publication?

When I create a new Transactional publication using a Publication Wizard, there is one step called Snapshot Agent which gives a possibility to:

1. Create a snapshot immediately
2. Schedule the Snapshot Agent

My question is when it might be necessary to schedule the Snapshot Agent for Transactional publication?

As far as I know, snapshot is used only to initialize new subscriptions. When snapshots are generated after a subscription is initialized, they are not applied to a Subscriber.

Thank you.

Alexey