I found Silverblue to be quite frustrating, perhaps I should take more time to learn it. IMO, Guix/Nix offer superior solutions.
Ultimately Silverblue is trying to be an “immutable” system without the need to coordinate packages and/or software. And such an approach is highly appealing for enterprise support, but the end result is somewhat of a Frankenstein system. Of course Nix is not without its warts, I can’t stand its language and documentation is terrible.
Overall I find Guix to be my favorite of the bunch. It’s legitimately a wonderful tool to develop with, I agree with the emphasis of reproducibility and bootstrapping, Guile is a wonderful language for configs/scripts, and it comes with a great manual. Even still, I couldn’t recommend GuixSD due to the lack of systemd and the hardline approach to free software (libre Linux).