Yes, Component Leads are a possibility.
Why I asked about the instance is because on JIRA Server you can install an add-on called ScriptRunner which will allow you to create a Script Function-type Post Function which can do basically anything you want, e.g only set a default Assignee if the field is empty.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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