We're updating the status of this idea to more accurately reflect its current status with our engineering team, and also made slight changes to the subject line in order for it to be more easily found. We can't guarantee a commitment to deliver on this feature request, but it should indicate some awareness that we have heard your feedback and could be taken under consideration for a future release.
In the meantime, an automation path will need to be recreated if you need to change the trigger type. Copying from a welcome-type trigger, will result in the copies also being that type, so if you're wanting a different trigger type, you'd need to make a new path.
To address your issue with deleting your automations, as long as the automation path isn't active, you can delete it. When I checked all the automations in your account, the option to delete the inactive and ended ones was available.
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