“If we want the digital Euro to become a success, we need a clear and convincing narrative of why we need it in the first place. People need to see the benefits of a digital Euro in their day-to-day lives. The European Central Bank and the European Commission have yet to make a compelling case of why we need the digital Euro and what added value it will deliver,” explained Markus Ferber MEP, the EPP Group Spokesman in the European Parliament’s Economic and Monetary Affairs Committee.
There is a whole website to explain that. Specifically, there is a PDF under the “Why might we need a digital euro?” section, but also this interview says similar things.