Italy has been unusually successful at getting citizens to hold a digital identity and unusually slow at making one identity sufficient. Consolidating the schemes into a single credential is the current objective, and the credential is the easy part.
The difficulty sits in the services. Public administrations built their online access on top of whichever scheme was available when they built it, and those integrations are old, undocumented in places, and maintained by suppliers who have moved on. Switching the front door means touching systems that have been left alone precisely because they work.
There is also an attribute problem that identity alone does not solve. Most public services do not just need to know who someone is. They need to know a fact about them: that a person is resident in a municipality, is a registered carer, holds a professional qualification, or is entitled to a benefit. Those attributes live in different registers with different update cycles, and an identity system that logs a user in successfully still leaves each service to check the attribute in the way it always did.
The version of this reform that changes daily life is therefore not the login screen. It is the attribute layer: a way for a service to ask a register a narrow question and get a signed answer without the citizen carrying a certificate between offices. That is a harder programme to explain, a slower one to deliver, and the only part of the plan that would remove a queue rather than move it online.