After weeks (months?) of neglecting guix-devel email and/or taking vacations, I learn that something unbelievable happened: *all* of #TeX Live has been imported in #Guix, as 4K+ individual packages, including “collections” and “schemes” (≅ meta-packages):
https://guix.gnu.org/manual/devel/en/html_node/Using-TeX-and-LaTeX.html

Thumbs up to Nicolas Goaziou for this achievement!