"Personally I do not consider the effort worthwhile, but this is my personal opinion. [...] I don't want, as a result of my ideas, to create problems to the Redis community."
Master has multiple meanings, not just slave master. As in mastery, master tape, master craftsman. In git, there are no "slave" branches, so "master" does not evoke slavery.
Here are a few commits: https://github.com/antirez/redis/search?q=%22slave+removal%2...
Here's the issue where some of the discussion happened: https://github.com/antirez/redis/issues/5335