I will note even namespaces for package management that don’t use DNS are a big step up over none. For example in PHP/composer/packagist and node/npm they just

I will note even namespaces for package management that don’t use DNS are a big step up over none. For example in PHP/composer/packagist and node/npm they just have a vendor name that can be reserved. It makes it very easy to distinguish “this package is from the (trusted vendor name here)” and prevents issues with namesquatting.