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Implementing a functionality for e.g. the danish national ID with a few million users, or Luxembourg, or Austria, isn't worth it.

So you'd have support for France, Germany, maybe Netherlands, and that's it.

With an EU-wide ID, the smaller countries profit significantly, and startups can integrate and use the functionality easier.

Because it will work for everybody everywhere the same way, which is part of creating a common market, instead of common mess.

> Why would you need an unified solution?

To facilitate freedom of movement within the bloc.

Because they would implement for 5 of the biggest EU countries and left the rest of us behind.

Spottify advertised itself in EU for half a decade or more, but has been available in my country for less than a year.

Because interfacing with 27 different ID solutions instead of one is a waste of effort and most companies wouldn't do it?

The underlying standards are already international. And their production is spanned across the world.