"Players would take the D-5 over the D-3 because of the cannons. I am surprised though that we didn't get a B series Stuka when the Stuka was updated, it would have been great for scenarios."
And that is why it was a D-3 to begin with. It could be used in place of B models in scenarios. An initial B model would have certainly meant that they were going to make later models too, now we have one which is somewhat representative for both Bs and Ds (and could be used to make the G).
I'd like to have D-5 because of MG151/20s, though. It is not a "Zero interceptor" but at least it could do something if it gets that one snapshot chance.
-C+