Maybe try to understand his point first?
From what I’ve gathered, Nix will create an immutable state of HA, but HA requires for additional packages to be downloaded - which NixOS doesn’t support/allow.
So users will end up with a broken HA install.
And guess where they will file bug reports about this? (Hint: It won’t be Nix…)
I remember various different concepts of USB flash drives with integrated LCDs that would display a label and the remaining capacity. Then they vanished and the only thing left were the Lexar Echo drives. Until a few years ago, when they have been pulled from the markets. Probably, because they didn’t work with the now default GPT and its many different partition types.