Really bryan?
How can you tell that?
From where I sit, you can mount a retractor anywhere, it can be clipped to a D ring, it can be put on almost any BCD strap, and it can be added just about anywhere using a sort of "rivet" attachment available with some retractors or screwed in place using a backplate that comes with some retractors.
Once the retractor is in place, items can be clipped in various manners, retractors come in an entire array of various clips in just about every size and shape.
And once the item is clipped to the retractor, it can be locked in place so the retractor acts just like a D ring, but then you have the distinct advantage of being able to use the item without unclipping it if you so desire! So if you're using it and you want to free up your hand, just let go of the piece of gear and - like magic- it retracts right back against your BCD. Not only that but an item that might not necessarily reach inside your pocket if it's clipped to a D ring can be put inside the pocket while still attached to the retractor..such as a dive light! So it's out of sight and not hanging there and you're even more streamlined. If it should happen to fall out of your pocket, it's not going anywhere because it's..um...attached to a retractor.
Sometimes it pays to think outside the box. Advanced technology is available. Those who thumb their noses at it are oftentimes doing themselves a disservice.