The original audio after mastering is also still called a master, but I haven’t seen anyone complain about that. And that (as well as the same meaning for other media) is the word that the branch name master came from, so etymology can’t really be an argument there (though I also think etymology is terrible reasoning for renaming something in general).
Yeah I don’t think anyone was called a remaster, different words even if they share the same root
Also master/slave was used in tech for awhile not just for forked branches, a couple examples are https://docs.oracle.com/cd/E88353_01/html/E37855/scsi-slave-9f.html in SCSI interfaces and replication systems like those used with databases https://jira.mariadb.org/plugins/servlet/mobile#issue/MDEV-18777
The original audio after mastering is also still called a master, but I haven’t seen anyone complain about that. And that (as well as the same meaning for other media) is the word that the branch name master came from, so etymology can’t really be an argument there (though I also think etymology is terrible reasoning for renaming something in general).