I feel like I'm in the minority that thinks this is a good idea. I can easily see how some people might be made uncomfortable by the existing wording, but more importantly, I can see no downside to changing it. It will be a very small amount of work for a very small amount of time and then everything will carry on as normal. If this helps make programming more inclusive, even in a small way, then I'm all for it.
Allowlist/denylist are perfectly fine if everybody uses them. But fragmented blocklist/denylist/etc sucks.
A lot of the suggestions for master/slave don't illustrate the same relationship between components, roles.