Over time, the focus of service desks has broadened from simply logging and resolving technical issues, to proving more comprehensive support for people and the business. They are increasingly being used to get various matters arranged, explained, and coordinated. The service desk has a major influence on user experience and how the service provider is perceived by the users. By understanding and acting on the business context of transactional activity (i.e. logging tickets), the service desk is better placed to add value to the organization.
Reference: https://www.bmc.com/blogs/itil-service-desk/

The purpose of the improve value chain activity is to ensure continual improvement of products, services, and practices across all value chain activities and the four dimensions of service management.
https://wiki.process-symphony.com.au/framework/lifecycle/service-value-systemitil-4/#:~:text=The%
20purpose%20of%20the%20improve,four%20dimensions%20of%20service%20management.