I like the MATE Desktop. If the package mate-desktop-environment is in
stalled *WITHOUT* "recommended" packages I get my desired skeletal Debian
system.
I believe changing one screen of the standard would give me what I want and
likely satisfy the maintainers mentioned above. In the screen titled
"Software selection", change the first line from "Debian desktop
environment" to "Install the desktop selected below with all recommended
utilities". If that option and the Gnome option are selected by default the
effect would be the same as the current installer. If I deselect the first
line and select MATE, I get my desired system.
Does such an installer already exist?