Just because you are a GNU maintainer, does not mean that you are part of any governance structure of the GNU project. In general, the GNU project favors _less_ maintainers, because multiple ones makes it a hassle to discuss matters of importance and take decisions -- this can specifically be seen in glibc.
It is quite unfortunate that some glibc maintainers and contributors have created this misunderstanding and continue to cause confusion on how GNU projects are maintained by calling GNU maintainers for "FSF stewards". They are GNU maintainers, so one should call them that. A GNU maintainer is quite free to ask contributors to take on more responsibilities, as is done in many GNU projects. But at the end of the day, a GNU maintainer can decide to rescind that responsibility, or delegate it to someone else. Or the FSF/GNU should recognize more official positions for people with rights and responsibilities in the GNU project to make you feel more empowered. The GNU project already does that, with specific people having extra upload rights, being members of various committes, or other such groups.