Just make a call. Is "blacklist" worth keeping? I've spent 25 years working in security, "blacklist" is a pretty core part of the lingo, and: fuck it; "blocklist" is just as good. But other people will answer for more-inclusive alternatives to "MITM", and I'm probably not going to change that.

At least 50% of the drama about these language shifts comes from people who can't handle making decisions that make people unhappy. Just put your big kid pants on, make a decision, and deal with the response, without hyperventilating about "cancellation".