In a normal project you can right-click on a task and Duplicate Task.
You can also click the 3 dots next to the section title and Duplicate Section.
You can not do either of these within a project template.
We need to continually keep our templates updated with the latest procedures, and duplicate sections out for repeated but slightly different processes.
Why is the “duplicate” functionality only available outside of templates and not inside templates?
Great suggestion; I agree that it can be frustrating to edit templates generally (esp. this duplication issue) relative to making the same edits in projects. Please make sure you upvote your own post!
In the meantime, you probably already know this if you read the threads you linked, but what a lot of people do is just create a project from the template, edit that, and then re-save it as a new template. You can do some things here (e.g., delete that untitled section from the board view that gets silently created by default, change the default dependency management option, etc.) that you simply can’t do in templates (yet).
Just chiming into this thread to say that I fully agree - project templates should have feature parity with the projects they create/are created from. The workaround of creating an entirely new project template is quite a pain for a simple edit like just adding one more task.
Somewhat related: I just put in a feature request for the ability to use task templates inside a project template, for very similar reasons to this: feature parity!
Please upvote if you have a chance