Explanation
Drip Feed Dispatching is a feature that allows dispatching groups of service appointments to technicians at regular intervals instead of all at once[56]. Enabling Drip Feed Dispatching in Field Service Settings allows turning on this feature for all service territories[57]. Setting the Number of Services to Drip Feed on the Service Territory allows specifying how many service appointments should be dispatched at a time for each service territory[58]. Setting the Service Appointment to Dispatch in Field Service Settings would not affect how many service appointments are dispatched at a time. Enabling Sharing of Dispatched Service Appointments would not affect how many service appointments are dispatched at a time. References:
https://help.salesforce.com/s/articleView?id=sf.fs_drip_feed_dispatching_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_drip_feed_dispatching_enable.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_drip_feed_dispatching_configure.htm&type=5

Explanation
Service Reports are documents that summarize the details and outcomes of a service appointment such as work performed, products consumed, customer feedback, etc.[72]. Using the standard Service Report would allow Field Service Technicians to capture details and customer approval on completed work and send them to the customer electronically by generating and emailing service reports from the Field Service Mobile App or the web browser[73]. Creating a Process Builder to generate a report would not allow Field Service Technicians to capture details and customer approval on completed work. Process Builder is a tool that allows users to automate workflows based on specified criteria and actions[74]. Creating a custom report would not allow Field Service Technicians to capture details and customer approval on completed work. Custom reports are reports that allow users to view data based on specific criteria such as objects, fields, filters, or charts[75].
Using the standard Work Order email template would not allow Field Service Technicians to capture details and customer approval on completed work. Email templates are templates that allow users to send predefined emails with merge fields[76]. References:
https://help.salesforce.com/s/articleView?id=sf.fs_service_reports_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_service_reports_generate.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.process_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.reports_builder_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.email_templates_overview.htm&type=5