The problem in this case (and many others) is that nostalgia is limited to the form, bordering on fetishism, while the utilitarian and economic aspects of the original are brushed aside.

From TFA: "The car had high wheel arches and soft suspension, letting it travel across a ploughed field or rough roads - as legend would have it, without breaking a tray of duck eggs. Its high roof let drivers wear a hat at the wheel. It was easy to drive and simple to repair."

Which of those qualities have been retained in this 2CV revival?

Well the suspension is less of an issue these days due to technical advances. Ground clearance is more of an issue than the suspension travel. This looks more like it's targeted towards city use than the countryside use of the original, especially as it looks to have a notably shorter wheelbase. There's a usecase for small city cars that look cute though.

Why does it need the same qualities as the old car?

People want cheap and small electric city cars, why not make it in the style of an iconic car? We already have plenty of mid sized cars that look all the same.