What is really important is the value that is provided to the city and end users - you get up to deliver information to your commuters in real time. This is hard/impossible to do if you need to deploy LCD signs that require massive roadworks to connect to power.
The fact that they don't break down is just a further testament to e-paper's versatility - we'll see more and more applications using e-paper in digital signage. There's a lot of examples what our customers are building on our blog, like smart citizen information (https://www.visionect.com/blog/soofa-sign-reinventing-citysc...) or trucks equipped with digital signs (https://www.visionect.com/blog/electronic-paper-truck-displa...).