You're mixing up the term "AR" with specific implementations of it. People are now using "MR" to mean something distinct from AR but GP and myself are arguing

You're mixing up the term "AR" with specific implementations of it. People are now using "MR" to mean something distinct from AR but GP and myself are arguing that the term AR was broad enough to encompass passthrough, overlay and any future developments. If someone built a VR headset that used small projectors rather than flat panel displays, we wouldn't need to invent a new term for it. The AR <> VR spectrum was all we needed and MR is just muddle on top of that.