When creating a Private Space, what is a valid reason to specify a region other than the default region?

When creating a Private Space, what is a valid reason to specify a region other than the default region?

A healthcare services client is requesting an architecture for a set of applications: one is a marketing application, and the other two are of customer service applications that allow for customers to interact with their healthcare records. The marketing application must be able to scale up within seconds in response to traffic spikes. The client wants to be able to deploy each of these applications to the U.S. East Coast and EMEA.
Which applications should be deployed into which Heroku runtime?

If an Organization member has the operator privilege on an app, that means the user can:

Universal Containers provides prompt service and has multiple service levels for different customers. Over
50% of Service Appointments are created on the same day they need to be completed. As a result, a Technician's daily schedule can change multiple times throughout the day.
What method of dispatching should a Consultant recommend implementing?