It's becoming more and more common even in new buildings. Build something simple and basic and then just stick a shell or wrap around it to make it look modern and quirky. I'm not sure Anfield will last 20 years either, the stand they've just done already looks shite!
Would still love City to do something to modernise the look of the side stands. The South Stand looks smart enough, but a bit concrete and grey on the sides. Not sure we'll ever expand them because of the logistical issues, but we'll see. More about how functional it is and what it's like inside.