If you click the "hamburger" icon in the upper right, you can choose alternative themes. I'm using contrast with a larger font, but you can also switch back to the old design (although I'm not certain how exactly it mirrors the old design).
Right, that is an option, but it unfortunately involves some effort from the user. This is effort that wasn't needed before. In my opinion, having to expend this extra effort even just once ends up harming the user experience relative to what it was before.