Global Admins can be rightfully nervy that project admins make unwanted changes to rules that could impact on server performance.
For this reason, many limit automation rules to Global admins only.
To solve this, we released permissions for project automation.
We could, however, go one better. It would be great if one could change a rule for a project and then just have an admin press one button to publish it. This is something Autoblocks have released and looks to be a handy feature.
Could also just enable permissions for certain classes of rules, like those that are scoped only to 1 project and that do asynchronous triggering for minimal performance impact.