It is about supporting "online cross-border transactions", in other words for providing a legally binding way for agreements to be made. This will be the basis for VISAs, proving you hold credentials (initially driving license, but will extend further), proving you've signed a contract. This MAY include a central-bank wallet with "digital Euro", or it may not, but even without, it's about money.

You can smell where this is going, no? This is how the EU is looking to make any kind of internet authentication go through them. By providing companies like telcos with an online identity that says "if a customer clicks 'buy' logged in through eIDAS and they don't pay, EU courts will if needed get the money from their homes, their mothers, sell their dog to make sure you get paid".

Then things like forcing kids off the internet, the always returning porn and copyright regulations rules and so on will follow.