Wero sounds similar to the US Zelle system but the big reason for that to exist in the first place is that bank account numbers are not safe to share in the US since they can be used to pull payments so there was never an option for easily transferring money to friends and family other than writing a cheque.

In the UK and Europe I could just share my bank account number or IBAN and make payments through online banking since the late 1990s (though in the UK they only became instant in 2008.) So Wero sounds like a nice convenience but much less of a game changer.

It will be interesting to see if it manages to expand to goods and services since the EU strictly regulates the fees Visa and Mastercard can charge there so there is less incentive to switch than in some other countries.

I think the biggest reason is sovereignty: we cannot risk US cutting our payment system if they for example don't give Greenland for them.

I think this is the biggest reason to ensure you can pay with a local system in shops and restaurants.