Tagging releases? Useful or not?

I will be totally honest.

Because I do have local modifications in our fork, testing against master (or anything that isn’t a fixed point in time if you prefer) does not give me anything worth testing against until there is a release candidate, tag or whatever you call it. So, I might just skip my testing until there is an open-release/xxx.1 tag.

This is back to the same issue we had before open-releases were created, people will be testing against multiple versions of master. And we won’t be able to agree that a fix is needed by someone because someone else tested it with a different version of master.