Declarative systems like NixOS or Guix system solve, since a reboot in an old generation is quick and done, mandatory FLOSS instead of black boxes and pull-base

Declarative systems like NixOS or Guix system solve, since a reboot in an old generation is quick and done, mandatory FLOSS instead of black boxes and pull-based upgrades instead of vendor-push-based ones do solve. A bug can always happen, being able to decide WHEN and HOW to risk and revert anything with ease it's what's needed. Unfortunately most of the world, many technicians included so far largely ignore any advancement over early '80s tech still in use today, before was zfs "a rampant layer violation" with btrfs and stratis as a good example of reactionary tech choices and monsters resulting from them, than it's about declarative systems vs the "container mania", a re-edition of full-stack-virtualization on x86 previous mania ALL because some big players profit (alone) from such designs...