Would you like to monitor all aspects of your application architecture from the user perspective? Maybe also his behaviour and how he uses your system. What about logs, root-cause analysis, distributed tracing, performance and infrastructure health?
Maybe you find out that testing is important but what kind of? Unit testing, integration, functional, usability, regression, performance, security, fault tolerance, recovery, system. We suppose you do not want to do them manually.
Are you 100% sure that at this moment your system have no vulnerabilities, optimal architecture and code that you might be proud of?