Hello Denis. I believe automatically invoking package managers for users does not give users control. Telling them what to run, yes, but running the commands for them does not seem like good practice, if it can be avoided. If I were a user, I would mostly like to understand.
In particular, the GNU Boot description on Savannah says it aims to replace boot code with 100% free software; the Canoeboot FAQ says it is impossible to get completely rid of Intel ME. I have never flashed Intel/AMD machines, so what do I know. Last time I checked, guix operations like pull needed almost 2GB RAM, because of Guile compilation not optimizing for memory use yet. Regards, Florian