Does anyone know what is the progress on accepted Arch RFCs or if they have already been implemented?

I'm talking about

• https://gitlab.archlinux.org/archlinux/rfcs/-/blob/master/rfcs/0004-lto-by-default.rst
• https://gitlab.archlinux.org/archlinux/rfcs/-/blob/master/rfcs/0003-buildflags.rst
• https://gitlab.archlinux.org/archlinux/rfcs/-/blob/master/rfcs/0002-march.rst

I read some time ago that there were doubts from package maintainers regarding the -march RFC because of lacking tooling. Does anyone know if there has been any progress on solving those problems?

And what about the other two RFCs?

Is there any way the community can help?