No need to replicate the production environment with all its servers and configurations, the check authors can easily run and develop their checks on their local machine with no unnecessary software setup hassle.
Package maintainers in full control of their package-related checks, no hurdles.
Can this new build of firefox package be safely updated? Do the functional tests pass for this new build of openssh?
Can this set of packages be pushed to stable? Is this new system compose installable?
Where applicable only the simplest interaction between services is used - passing messages through a message bus - for both check triggering and result reporting. No hardcoded tie-ins to specific services.
Comprised of loosely-coupled standalone units (tools, libraries) so that important logical functions are separated and one unit can be replaced with a different unit with similar functionality.