Everyone here have already explained their various stances very eloquently and convincingly - so I won't argue against that - so instead I'll just put forth my own 2c on why I use Silverblue instead of Nix/Ansible.

The main draw for me in using Silverblue (well, uBlue to be exact) is the no-cost, cloud-based, industry-standard, CI/CD and OCI workflow. Working with these standard technologies also helps me polish up my skills for work, as we've started to make use of containers and gitops workflows, so the skills that I'm gaining at personal level are easily translatable for work (and vice-versa).

With Nix (the declarative way), I'd have to learn the Nix language first and maintain the non-standard Nix config files and, tbh, I don't want to waste so much time on something that no one in the industry actually uses. Declarative Nix won't really help me grow professionally, and whilst I agree it has some very unique advantages and use-cases, it's completely overkill for my personal needs. In saying that, I'm happy with using Nix the imperative way though - I don't need to learn the Nix language, and it's great having access to a vast package repository and access my programs without having to go thru the limitations of containers.

As for Ansible, I'd have to have my own server (and pay for it, if it's in the cloud), and spend time maintaining it too. And although we use Ansible at work as well, so the skills I gain here won't be waste of time, it's unfortunately too inflexible/rigid for my personal needs - my personal systems are constantly evolving, whether it is in the common packages I use, or my choice of DE (my most recent fling is with Wayfire) etc. With an Ansible workflow, I'd be constantly editing yaml files instead of actually making the change I want to see. It's overkill for me, and a waste of time (IMO). You could argue that I'm already editing my configs on Github with uBlue, but it's nowhere as onerous as having to write playbooks for every single thing. And as I mentioned, I like to maintain some flexibility and manual control over my personal machines and Ansible will just get in the way of that.

With the uBlue workflow, I just maintain my own fork on Github with most of my customisations, + a separate repository for specific dotfiles and scripts that I don't want to be part of my image. Pull bot keeps my main uBlue repo in sync with upstream, and I only need to jump in if there's some merge conflicts that cannot be resolved automatically. At the end of it all, I get a working OCI image, with a global CDN and 90 days of image archives, allowing for flexible rollback options - all of this without incurring any costs or wasting too much time on my part. Plus I can easily switch between different DEs and OCI distros, with just a simple rebase - I could go from a Steam-Deck like gaming experience (Bazzite) to a productivity-oriented workstation (Bluefin), or play around with some fancy new opinionated environments like Hyprland and River (Wayblue) - all with just a simple rebase and a reboot, without needing to learn some niche language or waste time writing config files. How cool is that?