Explanation
Architecture of the ITIL SVS specifically enables flexibility and discourages siloed working. This is because the service value chain and practices do not form a fixed, rigid structure, but rather they can be combined in multiple value streams to address the needs of the organization in a variety of scenarios, with open flow of communication across the many interfaces.
Reference: https://www.bmc.com/blogs/itil-service-value-system/

Service management is a set of specialized organizational capabilities for enabling value for customers in the form of services. These capabilities include tangible things like capital, people, and equipment, and can also include intangible things like knowledge, management and skills. These capabilities can also include intangible things, like knowledge, management, and skills.
https://www.bmc.com/blogs/itil-key-concepts-service-management/#:~:text=Service%20management%20is%20

Customers are one of the key stakeholder groups that service providers should cooperate with. Customers are the persons who define the requirements for a service and take responsibility for the outcomes of service consumption1. Customers can be internal or external to the service provider's organization2. Customers are essential for value co-creation, as they provide feedback, resources, and demand for services3. References: ITIL Foundation - ITIL 4 Edition, page 5; ITIL 4 - A Pocket Guide, page 18; [ITIL
4 Practice Guide: Customer Relationship Management], page 7.