Visa and co. don’t own technology. [...] the implementation is left to banks and financial providers.
That's exactly backwards.
The store POS system doesn't connect directly to every individual bank that issues a card. They connect to Visa's server which authenticates the transaction. They're the network in the middle of the system that everyone else connects to. The banks just provide the account to transact from.
You can’t just build an app that uses NFC, like you build an app that uses a phone camera.
Then how is this new Digital Euro supposed to do NFC transactions if they can't use the NFC?
This isn't quite right.
A technological improvement in production efficiency does shorten labor time per output.
However, employers don't respond to this new efficiency with shortened work hours.
They respond with fewer laborers.
Improved technological efficiency, leads to higher unemployment.