The problem with transparent parts is they sometimes need extra modelling in respect to a solid version or the would 'look' wrong. For example if the pattern is visible trough the whole part it should be modeled onto both sides of a 'wall' or sticker sub part depending on the design of the real-life brick , it might even need internal crossbeams to illustrate the material layers inside the plastic etc.
You could even argue transparent parts should be modeled in two fold (all surfaces present in both windings) all over, so it behaves like expected with bfc enabled. And to be absolutely perfect studs and the likes should not simply be placed 'upon' a big rectangle.
All this, off course, is only interesting for extremely high quality renderings. I personally I'm fine with the current transparent parts for editing purposes etc.
You could even argue transparent parts should be modeled in two fold (all surfaces present in both windings) all over, so it behaves like expected with bfc enabled. And to be absolutely perfect studs and the likes should not simply be placed 'upon' a big rectangle.
All this, off course, is only interesting for extremely high quality renderings. I personally I'm fine with the current transparent parts for editing purposes etc.