My personal opinion on the whole ‘master/X’ terminology in tech is-- good riddance-- and I don’t write master/X because I don’t want to write the word ‘slave’, or that I think the word ‘master’ necessarily refers to slavery--I am using it as a segue to my point, which is that the technical terminology has been abused so badly throughout the years as to be now completely meaningless to the point of being confusing, which is another excellent reason to abandon it.
See: Git. There’s master, and there’s…..???? I don’t see any slave branches. ‘Main’ among pretty much anything else sounds more appropriate. There’s ATA, where ‘master’ and ‘slave’ are the equivalent of ‘#1’ and ‘#2’--the master and slave devices do not communicate at all with each other, only with the controller and it is a completely meaningless designation other than you cannot have a #2 without a #1.
From one-sided to meaningless to BIND: you can lose all the slaves you want but if you lose the master, you’re fucked, and its idea of master-mast