Especially if you're on an SELinux system.
Rootless docker is perfectly fine.
As an official configuration? Or in random copy paste guides? The former is very different than the latter. It's not uncommon to disable sudo passwords, but it would be considered a serious security lapse if that were the default on some OS.
https://docs.docker.com/engine/install/linux-postinstall
If the official sudo project had a guide on how to disable passwords, that shouldn't be taken as endorsement of having that as a default config.
Adding the user to the docker group by default, out of the box, is Omarchy-specific.
EDIT: More accurately, was Omarchy specific, until they realized that it's not a good idea and changed it.
However, I agree that it should be opt-in. Docs should be more explicit about that too, they should warn users about risks of going with that option. That excerpt mentioned in the article was rather misleading.