It's a fashion thing.
A few decades back, European imports always had amber turn signal lenses at the rear.
American and Japanese makers followed.
More recently, Euro cars have had only red lenses at the rear, and American and Japanese and Korean makers have followed.
I like amber rear turn signals, but BMW and Mercedes have decided that red is a more premium look now, so the rest have followed.
A few decades back, European imports always had amber turn signal lenses at the rear.
American and Japanese makers followed.
More recently, Euro cars have had only red lenses at the rear, and American and Japanese and Korean makers have followed.
I like amber rear turn signals, but BMW and Mercedes have decided that red is a more premium look now, so the rest have followed.