JZ explained that this must be the case - they are required to be new options in the way they are written. We should have a goal of clearing the list completely - either fixed or agreed never to be fixed and therefore off the list. It is felt useful to have everything in one place, and not to have to keep switching between NCS and C standards. This is an issue. It is an approved amendment.
Nobody knows of anyone who is using it.
It could be withdrawn. AR and JZ believe this is premature at this point. AR thought this would probably disenfranchise too many. With respect to duplicated functionality, we probably need to leave these in. Streams and Sys V IPC are probably the hardest ones.