Doing Things the Right Way
I am not trying to be “hot takey”, but there is no way to deliver (co-create) quality IT services without a quality CMDB.
Further, the quality of your services will be defined by the quality of your CMDB.
For example, most mature Incident Management processes/practices are based on the info in the CMDB. The same goes for assessing the risk of Changes, investigating the Root Cause of Problems, etc.
Taking it a step further, your CMDB should drive your Business Continuity and Disaster Recovery Plans.
Also, your CMDB should be able to lead the conversations around application rationalization, reducing technical debt, and even reducing the software licensing costs.