Thats what was said, for some applications 1c is good, for others 0,5 or even 0,25 is better. It depends on your usecase. Frequency regulation is often 1c, while if you are primarily concerned about depth, you could choose another configuration. It is also partly dependent on chemistry.
As an example: a 100kWh can be at either 1c discharge rate, or 0,5c. 50 kW(0,5c) is usually cheaper because there is less need for hardware (and I believe less risk of thermal runaway)
It would have to be more than that. If it’s supposed to be backed by EU there would have to be an agency responsible for it’s development and security. The moniker “EU certified” would require some sort of code evaluation and certification agency. As such it would become rather powerful.
I think it’s a good idea, the OS would give the market a focus and allow for a collected development effort without excluding anyone active today from participating. Kinda like what I think Android was, without the risk of lock-in as it would be government funded.
The big question is if this would be within the current EU mandate, though.