The issue with further publicizing those images is that Debian cannot reasonably offer community support for those nonfree bits. Only the vendor can, or some other company that signed a deal with the vendor. (Canonical happens to be one of those companies)
Regarding non-free support, assuming the firmware is in Debian's non-free repository, Debian already provides support. From their policy[1], distributed non-free software "must not be so buggy that we refuse to support them." That sounds to me like they already offer support (whatever that means for a volunteer-driven project).
So they already release unofficial installers with non-free binaries included, already have a repository that contains non-free binaries, and seemingly offer limited technical support for non-free binaries. Yet they have opted to not readily present these options easily to a potential user.
[1] https://www.debian.org/doc/debian-policy/ch-archive#s-non-fr...
That "must not be so buggy that we refuse to support them" is a requirement for all packages that Debian ships, the difference with the nonfree packages is that if a breaking bug happens, the only real option there is to delete the package until the vendor fixes it.