As someone who spends an inordinate amount of their life reviewing planning applications, it's notable that most new properties include swift bricks (and bat bricks) pretty much at standard now, even without the regulations. They're incredibly cheap and entirely non-obtrusive; from a conservation point of view it's a no brainer.
I imagine most that don't include it is more through either laziness or ignorance rather than a strategic choice to omit them. Having them in the regulations would seem an easy win.