These two ways allow dispatching the appropriate technicians based on customer feedback, as they allow defining which resources are preferred or avoided by customers or accounts. References:https://help.
salesforce.com/s/articleView?id=sf.fs_resource_preferences.htm&type=5

A custom lightning component that displays work order progress can be created using Lightning Web Components or Aura Components and deployed to technicians through the Field Service Mobile App using Mobile App Extensions. Adding the work order line items related list to the work order page layout would not show the work progress on the work order line-item card in the Field Service Mobile App. Creating a custom visual force page or a report chart would not be compatible with the Field Service Mobile App user interface.
References: https://developer.salesforce.com/docs/component-library/documentation/en/lwc https://developer.
salesforce.com/docs/atlas.en-us.lightning.meta/lightning/https://help.salesforce.com/s/articleView?id=sf.
fs_mobile_app_extensions.htm&type=5

Permission Sets are records that grant users access to specific features or apps such as Salesforce Field Service
[214]. Scheduling licenses are records that grant users access to scheduling features such as Dispatcher Console or Optimization[215]. Creating Permission Sets and assigning the Salesforce Field Service Resource Permission Set and Scheduling license to each Technician would allow Universal Containers' Technicians to update their own appointments' status using the Dispatcher console Gantt chart by granting them access to Salesforce Field Service mobile app features such as updating status and granting them access to scheduling features such as viewing Gantt chart[216]. Creating Permission Sets and assigning the Salesforce Field Service Scheduling and Mobile Permission Sets to the Resource profile would not allow Technicians

This option allows tracking the return of a defective product and its replacement with a new one, ifapplicable.
References:https://help.salesforce.com/s/articleView?id=sf.fs_return_orders_overview.htm&type=5

This option allows tracking the required work for each machine separately, and scheduling a service appointment for each work order line item. References:https://help.salesforce.com/s/articleView?id=sf.
fs_work_order_line_items.htm&type=5