Hi Adam! Good to see you here 🙂
Yes you're correct. The experiment names must be unique. Just tested your flow, and it does throw an error even if the experiment is deleted.
But I think you're right that if you delete the experiment, it doesn't make sense to still require the experiment name to be unique. Will file a ticket to fix that.
Teams typically do append a timestamp or build ID so that they version the experiment, but it's a good note that we should probably add support to handle this. We are going to be adding supporting for metadata tags on experiments soon so that teams can quickly filter through them!