Regardless, I for one like that they can't be rotated. To me it's part of the game style. It forces you to think about city rearrangement, frustrating as it may be.They have the sandbox and you can rotate buildings in their newest game, Rise of Cultures. If they had "learned" that it was bad they wouldn't have put in their newest game.
However, I've heard many people say elvenarch doesn't work well, if at all, on mobile. That makes efficient city design for them more difficult. It'd be nice for someone to create a mobile friendly version of elvenarch. It isn't as easy as many people think to take a program written for one type of platform and port it to another, especially when it's someone running it for free. Inno has different developers for the mobile and browser versions of the game.
Another problem in Elvenar, as @SoggyShorts has pointed out whenever this has come up, is the sheer amount of updating to the artwork of the humongous number of buildings since they weren't created to be seen from any other side. Remember, the artwork also includes the animation in the building too.