Whenever a new addon is installed, for example, a deployer or event system, a restart of the appropriate service is required. Enable an option of restarting it via add-on directly.
Or have a configuration to do so by default.
Automatic load of extensions is implemented for all Content Manager extension points: Core, Content Manager Explorer (UI), and Connectors
Content Delivery extension points indeed do not have such capability and all extensions are loaded during service startup (requires a restart when Add-on is added or updated)
Due to technical limitations as well as the fact that customizations are used more on the Content Manager side, we are not considering adding automatic load for extensions to Content Delivery services
In case you do experience issues with Content Manager extension points please raise a regular support ticket
Whenever a new addon is installed, for example, a deployer or event system, a restart of the appropriate service is required. Enable an option of restarting it via add-on directly.
Or have a configuration to do so by default.