We still need something which can make sure we have enough energy for a https://en.wikipedia.org/wiki/Dunkelflaute, but at least looking at all of Europe that seems to be manageable with existing energy storage techniques (individual countries have longer Dunkelflaute, but if e.g. there's one only in Germany we can just import from Italy and vice versa)
We don't have to make sure we get to 0% all the time. We need to reduce putting CO2 in the air. If we burn some Gas in the winter it isn't the end of the world.
The focus must be on maximum climate impact per dollar.
(German wiki has more numbers)