Earlier quoted context omitted.
> some customer imposes it on our delivery contract It's happening: Companies are adopting Nix [0] and you may see such requirement come up some time. [0]: https://github.com/ad-si/nix-companies
In the bubble I live on, classical VMs have become the exception nowadays, containers and serverless deployments are the rule now. I am yet to see any classical VM deployment isn't one variation of Debian, Ubuntu, Red-Hat, SuSE. Note how that list has a certain startup feeling to the company list, not boring big corp.
Several of those companies (replit) are building their business on nix.
With nix, even containers are optional.