You're allowed to it's just not recommended because it showed zero effort in finding a related text.
So I definitely agree with parts of this argument - So like,
there is no actual disadvantage in marking. A teacher won't see it and mark you down for your choice of ORT. However:
- A choice of another prescribed text will often not work as well as a text specifically chosen to complement your text. All the prescribed texts present their own themes in their own way - They don't put two close to identical texts on the list for a reason. So choosing another Prescribed may not work as well. If you do it, make sure it's not just a convenience thing and that it actually is chosen for a reason.
- If you pick a popular prescribed (like Metropolis), there are very established arguments and patterns with which to analyse that text. This means there is an established standard, and it will be harder to "bluff" your way through the analysis of the text. Not that you should be bluffing, but it's like discussing Harry Potter with a diehard fan who's read every book multiple times, versus someone who just watches the movies in the background when they're on of a Friday night - A much more rigorous conversation

This said, Metropolis works well with BNW, and I'm sure you'd do it justice bellerina!
