You can either say "fly heading 360 for traffic" once or spend the next 5-10 years in courtrooms and giving depositions saying "there's no separation requirement to VFR's in class D airspace".
Try standing up in court after a nasty, saying "we don't separate VFR from IFR in Class D"
I agree - it is better to be more watchful than not. All I am saying is that it may be more helpful to change the airspace class just to better reflect what is routinely done.
I heard about a midair collision recently where two very experienced pilots were under ATC. One died. Neither could see the other and it would seem the Tower didn't know what was going on.
The accident report on page 62 just said
they don't seperate VFR from VFR in Class G!!