> IMHO, it is a great package manager, especially when being concerned
> about (bit-wise) reproducibility, 'slotting' various versions and fast
> movement with low risk (reversible upgrades).
> The one feature I miss compared to portage is the configuration via USE
> flags: One could patch Guix package definitions to add compile to flags
> etc, but you can't simply let the package manager resolve the
> dependencies for you.
You are so naive and I couldn't stop laughing.
Did you even watch my presentation?