For me, it was easier to just continue to use Ansible for machine reproducibility. I really like the thought behind Nix but I felt like I needed to elbows deep in it 24/7 to really grok it. And if I stopped looking at Nix for 6 months, then that knowledge just disappeared. I migrated away from NixOS for my homelab because I would come back to flakes I had written and not understand how anything worked and couldn't be bothered to relearn. I know that Ansible and Nix can sometimes be apple and oranges but I know that I can come back to a playbook and understand what it does even if I haven't touched Ansible for years.