What people in Europe do very frequently is buying from online shops of another country, either because they do not find the product in a local shop or because of better prices.

What is needed is a card for online shopping that is valid in all Europe.

But it's not the card. Wero isn't doing anything new. It's just yet one more payment method to implement. Adyen, Stripe, Shopify and many other already support different local payment methods.