-_-
Again FM radio was not part of the feature set till GDR2 was announced so making in mandatory for manufacturers before hand was not needed
And who said that FM Radio was not an expected feature. During the launch of WP8 last year, Microsoft said they didn't have the time to include FM Radio and Notification features in the OS as they didn't have time.
It's Nokia's fault to have missed Microsoft's statement and deliberately removed the FM chip to save on cost.
Search the internet for Windows Phone 8 launch news and you'll find it.
This link is an example.
WindowsMania.pl also has a thread on this.
Now, Nokia would definitely have known about this, yet they blindly ignored it.