We need the A26 like we needed the B29. A: it would not be filling and gaps in the AH plane set. B: we already have the A20, B26, Mossi IV, IL-2, and a whole host of jabo aircraft. D: I count 37 more important aircraft to add to AH (don't make me list them

). D: HTC has many other more important things to work on than another "flash-bang" project.
Regarding the Firefly's TD's designation- Even if the terminology was not there, the doctrine was. The Firefly's did not over-take 75mm armed Cromwell and Sherman tanks for a multitude of reasons, most notably the Firefly's lackluster HE capability and the less than desired ability to manufacture/deliver enough of them to the western front. Hence, having 1 Firefly mixed in with 3-4 Cromwell or Sherman tanks for the sole purpose of engaging German armor. Obviously, when called upon or when in a pinch the Firefly was going to set aside the AP and do all it could do with its weaker (and much slower firing) HE.