We see bias with most discussions.
Only cons with Guix I see is, lack of infrastructure and less volunteers to work on guix eco-system. If its solved, I can imagine guix can improve exponentially.
Lean and agile theory says that quality is improved and efficiency gained by going upstream and eliminating the things that are producing poor quality in the first place.
Llm code tools may be useful to give syntax tips, but like a thoughtless dev on a team, likely introduce more work than they get done.
I would never use llm code in prod without understanding it, but for one-off utilities it has been really great so far.