If you block name reuse globally, you introduce a new attack surface: permanent denial by squatting on retired names. Companies mess up names all the time from typos, failed rollouts, or legal issues. A one-shot policy locks everyone into their worst error or creates a regulatory mess over who can undo registrations.

Namespaces are annoying but at least let you reorganize or fix mistakes. If you want to prevent squatting, rate limiting creation and deletion or using a quarantine window is more practical. No recovery path just rewards trolls and messes with anyone whose processes aren't perfect.