I guess that is true if you use the "stock" fbx exporter.
I am using the bridge. daz 3d to c4d.
And i am having kind of the opposite problem. My textures and such are not in a color or diffuse channels.
But rather in a luminance and a reflection channel, it annoys the crap out of me.
Looks like the dev is rather confused about using redshit/octane stock physical render or plain vanilla.
Even tho there is a convert mat and textures to "octane or redshift" button in the plugin on the c4d side
There is always something to fix in materials when exporting.
Using the "Daz stock" exporter you need to fix a lot of stuff.. using the daz bridge.. need to fix a lot of stuff..
Lol. dosent matter how you export.

And the damn eyelashes always needs to be fixed.
View attachment 4362487
I haven't tried the Daz3d to Blender Bridge, so i am not sure if it does somewhat the same there.